Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details)

v3.21.1
SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 5 Months Ended 7 Months Ended 10 Months Ended 12 Months Ended 180 Months Ended 195 Months Ended
Jun. 11, 2020
$ / shares
shares
Aug. 22, 2019
USD ($)
participant
Jun. 30, 2020
USD ($)
Jan. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
$ / shares
May 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
shares
Oct. 31, 2019
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
plan
$ / shares
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2013
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Stock based compensation expense | $                   $ 11,500          
Common stock, par value (in dollars per share) | $ / shares         $ 0.0001   $ 0.01 $ 0.0001 $ 0.01 $ 0.01   $ 0.01 $ 0.01   $ 0.01
Match, percent of employee's compensation                   3.00%          
Contribution, percent of employee compensation                   3.00%          
Contributions to defined contribution plans | $             $ 8,500 $ 13,600   $ 21,900 $ 22,200        
Defined benefit plan, assumptions, term of salaries average                   3 years          
Defined benefit plan, assumptions, average salaries annual increase                   5.00%          
Number of closed defined benefit plans | plan                   2          
Defined benefit plan, contribution, percent of salary                       7.35% 7.00%    
Defined benefit plan, employee minimum required contribution for match                   5.00%          
Number of defined benefit plans, designated for nonoriginal members | plan                   3          
Number of closed defined benefit plans, designated for nonoriginal members | plan                   2          
Expected amortization of net actuarial losses next fiscal year | $                 $ 0 $ 0   $ 0 $ 0    
Pension liability | $                           $ 2,900  
Pension liability, service period                   20 years          
Estimated cash contributions, next fiscal year | $                 $ 18,000 $ 18,000   $ 18,000 $ 18,000    
Executive KEIP                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Retention payment | $               3,100              
Executive KEIP | Threshold                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   $ 3,100                          
Executive KEIP | Target                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   6,100                          
Executive KEIP | Exceeding Target                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   $ 12,300                          
Non-Executive KEIP                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, number of employees | participant   183                          
Payout percent contingent on financial targets   50.00%                          
Payout percent contingent on continued employment   50.00%                          
Retention payment | $               $ 3,200              
Non-Executive KEIP | Threshold                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   $ 7,700                          
Non-Executive KEIP | Target                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   10,300                          
Non-Executive KEIP | Exceeding Target                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Employee incentive plan, cash award | $   $ 15,400                          
Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Retention payment | $     $ 8,400 $ 6,700 $ 9,200 $ 3,500                  
Shares granted (in shares)                 28,334            
Options vested (in shares)                 96,008            
Shares available for grant (in shares)                 1,571,590 1,571,590   1,571,590 1,571,590    
Unrecognized compensation costs | $                 $ 3,400 $ 3,400   $ 3,400 $ 3,400    
Stock options, weighted average remaining contractual term, non vested                   8 years 7 months 6 days          
Stock options, weighted average remaining contractual term, vested and exercisable                   8 years 6 months          
Granted (in dollars per share) | $ / shares                 $ 10.99            
2012 Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)                 133,334            
Options vested (in shares)                 47,255            
Shares available for grant (in shares)                 153,184 153,184   153,184 153,184    
Unrecognized compensation costs | $                 $ 1,100 $ 1,100   $ 1,100 $ 1,100    
Weighted average exercise price, vested and exercisable stock options (in dollars per share) | $ / shares                 $ 61.82 $ 61.82   $ 61.82 $ 61.82    
Stock options, weighted average remaining contractual term, non vested                   7 years 6 months          
Stock options, weighted average remaining contractual term, vested and exercisable                   2 years 7 months 6 days          
Granted (in dollars per share) | $ / shares                 $ 11.30            
2012 Incentive Plan | Common Stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares authorized (in shares)                             4,000,000
Restricted stock awards                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   413,035          
Restricted stock awards | Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares) 656,617           312,606   247,204            
Shares vested (in shares) 73,131               2,780            
Shares forfeited (in shares) 227,884               268,850            
Unrecognized compensation costs | $                 $ 10,300 $ 10,300   $ 10,300 $ 10,300    
Cost not yet recognized, weighted average period                   2 years 4 months 24 days          
Stock based compensation expense | $             $ 2,400                
Grant date fair value (in dollars per share) | $ / shares $ 38.52               $ 30.51 $ 30.51   $ 30.51 $ 30.51    
Restricted stock awards | Annual Director Awards                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   44,946          
Grant date fair value (in dollars per share) | $ / shares                 $ 15.76 $ 15.76   $ 15.76 $ 15.76    
Restricted stock awards | 2012 Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                 165,831            
Shares vested (in shares)                 53,785            
Shares forfeited (in shares)                 1,500            
Unrecognized compensation costs | $                 $ 3,700 $ 3,700   $ 3,700 $ 3,700    
Cost not yet recognized, weighted average period                   2 years          
Shares consolidated from Era Group (in shares) 151,768                            
Grant date fair value (in dollars per share) | $ / shares $ 21.68               $ 12.68 $ 12.68   $ 12.68 $ 12.68    
Performance restricted stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   161,668          
Vesting period                   3 years          
Performance restricted stock | Period One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   150,001          
Grant date fair value (in dollars per share) | $ / shares                 7.73 $ 7.73   7.73 7.73    
Performance restricted stock | Period Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   11,667          
Grant date fair value (in dollars per share) | $ / shares                 24.54 $ 24.54   24.54 24.54    
Non-performance Restricted Stock                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)                   206,421          
Grant date fair value (in dollars per share) | $ / shares                 $ 19.41 $ 19.41   $ 19.41 $ 19.41    
Stock options                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)                   161,668          
Options forfeited (in shares) 145,263                            
Vesting period                   3 years          
Stock options | Period One                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)                   150,001          
Granted (in dollars per share) | $ / shares                   $ 10.99          
Stock options | Period Two                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)                   11,667          
Granted (in dollars per share) | $ / shares                   $ 14.56          
Stock options | Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares) 433,283                            
Cost not yet recognized, weighted average period                   2 years 4 months 24 days          
Vesting period                   4 years          
Stock options | 2012 Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Cost not yet recognized, weighted average period                   2 years 2 months 12 days          
Restricted Preferred Stock | Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Granted (in shares)             188,210                
Preferred Stock Options | Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)             113,081                
Common Stock Options | Management Incentive Plan                              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                              
Shares granted (in shares)             265,049                
Options vested (in shares) 48,448                            
Options forfeited (in shares) 151,307