Quarterly report pursuant to Section 13 or 15(d)

DEBT - Narrative (Details)

v3.20.4
DEBT - Narrative (Details)
 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Aug. 18, 2020
USD ($)
Jun. 11, 2020
USD ($)
Dec. 07, 2012
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2010
promissoryNote
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Apr. 17, 2018
subsidiary
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]                        
Repayments of debt       $ 5,629,000   $ 366,750,000 $ 126,231,000          
Total long-term debt         $ 568,368,000   568,368,000     $ 515,385,000    
Long-term debt         616,437,000   616,437,000     561,124,000    
Secured Debt                        
Debt Instrument [Line Items]                        
Number of promissory notes | promissoryNote               2        
Secured Debt | PK Air Debt                        
Debt Instrument [Line Items]                        
Repayments of debt         5,400,000   16,100,000          
Long-term debt         193,516,000   193,516,000     207,326,000    
Secured Debt | Macquarie Debt                        
Debt Instrument [Line Items]                        
Repayments of debt         2,400,000   7,200,000          
Long-term debt         143,771,000   143,771,000     148,165,000    
Secured Debt | Lombard Debt                        
Debt Instrument [Line Items]                        
Repayments of debt         3,300,000   9,400,000          
Long-term debt         146,052,000   146,052,000     136,180,000    
Secured Debt | Promissory Note One                        
Debt Instrument [Line Items]                        
Repayments of debt             12,700,000          
Long-term debt, gross                       $ 19,000,000.0
Secured Debt | Promissory Note Two                        
Debt Instrument [Line Items]                        
Repayments of debt             4,000,000.0          
Long-term debt, gross                       $ 5,900,000
Senior Notes | 7.750% Senior Notes                        
Debt Instrument [Line Items]                        
Repayments of debt         $ 12,200,000   $ 12,200,000          
Stated interest rate     7.75%   7.75%   7.75%          
Face amount     $ 200,000,000.0                  
Proceeds from issuance of long-term debt     $ 191,900,000                  
Total long-term debt                 $ 136,800,000      
Repurchased debt         $ 12,100,000   $ 12,100,000          
Percentage of principal amount redeemed         97.50%   97.50%          
Interest expense, debt         $ 400,000   $ 400,000          
Loss on extinguishment of debt         200,000   200,000          
Long-term debt         126,582,000   126,582,000     0    
Term Loan                        
Debt Instrument [Line Items]                        
Repayments of debt   $ 61,500,000                    
Long-term debt         0   0     $ 61,500,000    
Prepayment of premium   $ 600,000                    
Line of Credit | ABL Facility                        
Debt Instrument [Line Items]                        
Long-term debt         0   0          
Number of borrowers | subsidiary                     2  
Line of credit increase, last in, last out tranche $ 5,000,000.0                      
Maximum borrowing capacity 80,000,000.0                      
Maximum borrowing capacity increase $ 115,000,000.0                      
ABR Rate | Line of Credit | ABL Facility                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 2.50%                      
ABR Rate | Line of Credit | Asset Backed Revolving Credit Facility, Swingline Loan                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 2.50%                      
LIBOR or NIBOR | Line of Credit | ABL Facility                        
Debt Instrument [Line Items]                        
Basis spread on variable rate 3.50%                      
Letter of Credit | Line of Credit | ABL Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity         $ 14,200,000   $ 14,200,000