Annual report pursuant to Section 13 and 15(d)

FAIR VALUE DISCLOSURES - Fair Value of Debt (Details)

v3.21.1
FAIR VALUE DISCLOSURES - Fair Value of Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Feb. 28, 2021
Mar. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Unamortized debt issuance costs $ 8,500    
Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 6.875% 6.875%  
Unamortized debt issuance costs $ 8,500    
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 543,493   $ 561,124
Carrying Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 391,550    
Carrying Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 146,006   136,180
Carrying Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     207,326
Carrying Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     148,165
Carrying Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 5,631   7,618
Carrying Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 306   335
Carrying Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     61,500
Level 1 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 1 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0    
Level 1 | Fair Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 1 | Fair Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     0
Level 1 | Fair Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     0
Level 1 | Fair Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 1 | Fair Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 1 | Fair Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     0
Level 2 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 560,102   505,038
Level 2 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 398,870    
Level 2 | Fair Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 155,270   122,165
Level 2 | Fair Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     180,290
Level 2 | Fair Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     138,133
Level 2 | Fair Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 5,656   7,221
Level 2 | Fair Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 306   335
Level 2 | Fair Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     56,894
Level 3 | Fair Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 3 | Fair Value | Senior Notes | 6.875% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0    
Level 3 | Fair Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 3 | Fair Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     0
Level 3 | Fair Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     0
Level 3 | Fair Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 0   0
Level 3 | Fair Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 0   0
Level 3 | Fair Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value     $ 0