Annual report pursuant to Section 13 and 15(d)

FAIR VALUE DISCLOSURES - Schedule of Unamortized Debt Discount (Details)

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FAIR VALUE DISCLOSURES - Schedule of Unamortized Debt Discount (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized discount $ 21,649 $ 50,660
Lombard Debt | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized discount 21,495 26,372
Airnorth Debt | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized discount 154 605
PK Air Debt | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized discount 0 12,620
Macquarie Debt | Secured Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unamortized discount $ 0 $ 11,063