Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE DISCLOSURES - Fair Value of Debt (Details)

v3.20.2
FAIR VALUE DISCLOSURES - Fair Value of Debt (Details) - USD ($)
Sep. 30, 2020
Mar. 31, 2020
Dec. 07, 2012
Senior Notes | 7.750% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Stated interest rate 7.75%   7.75%
Carrying Value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 644,369,000 $ 561,124,000  
Carrying Value | Secured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 17,069,000    
Carrying Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 198,217,000 207,326,000  
Carrying Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 145,232,000 148,165,000  
Carrying Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 139,399,000 136,180,000  
Carrying Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 6,624,000 7,618,000  
Carrying Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 329,000 335,000  
Carrying Value | Senior Notes | 7.750% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 137,499,000    
Carrying Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value   61,500,000  
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 | Secured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 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 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 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 | 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 | Senior Notes | 7.750% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 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 670,022,000 505,038,000  
Level 2 | Fair Value | Secured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 17,069,000    
Level 2 | Fair Value | Secured Debt | PK Air Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 205,627,000 180,290,000  
Level 2 | Fair Value | Secured Debt | Macquarie Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 153,119,000 138,133,000  
Level 2 | Fair Value | Secured Debt | Lombard Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 150,211,000 122,165,000  
Level 2 | Fair Value | Secured Debt | Airnorth Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 6,778,000 7,221,000  
Level 2 | Fair Value | Secured Debt | Humberside Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 329,000 335,000  
Level 2 | Fair Value | Senior Notes | 7.750% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 136,889,000    
Level 2 | Fair Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value   56,894,000  
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 | Secured Debt      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value 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 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 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 | 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 | Senior Notes | 7.750% Senior Notes      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value $ 0    
Level 3 | Fair Value | Term Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, fair value   $ 0