Quarterly report pursuant to Section 13 or 15(d)

DEBT - Schedule of Debt (Details)

v3.20.4
DEBT - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 07, 2012
Debt Instrument [Line Items]        
Long-term debt $ 616,437   $ 561,124  
Less short-term borrowings and current maturities of long-term debt (48,069)   (45,739)  
Total long-term debt 568,368   515,385  
Secured Debt | PK Air Debt        
Debt Instrument [Line Items]        
Long-term debt 193,516   207,326  
Secured Debt | Macquarie Debt        
Debt Instrument [Line Items]        
Long-term debt 143,771   148,165  
Secured Debt | Lombard Debt        
Debt Instrument [Line Items]        
Long-term debt 146,052   136,180  
Secured Debt | Airnorth Debt        
Debt Instrument [Line Items]        
Long-term debt 6,189   7,618  
Secured Debt | Humberside Debt        
Debt Instrument [Line Items]        
Long-term debt 327   335  
Senior Notes | 7.750% Senior Notes        
Debt Instrument [Line Items]        
Long-term debt $ 126,582   0  
Total long-term debt   $ 136,800    
Stated interest rate 7.75%     7.75%
Senior Notes | 7.750% Senior Notes | Era        
Debt Instrument [Line Items]        
Long-term debt     142,000  
Term Loan        
Debt Instrument [Line Items]        
Long-term debt $ 0   $ 61,500