Quarterly report pursuant to Section 13 or 15(d)

VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Other Significant Affiliates - Unconsolidated (Details)

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VARIABLE INTEREST ENTITIES AND OTHER INVESTMENTS IN SIGNIFICANT AFFILIATES - Other Significant Affiliates - Unconsolidated (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2020
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated affiliates   $ 5,368 $ 5,368 $ 77,058
Cougar        
Schedule of Equity Method Investments [Line Items]        
Voting interest   25.00% 25.00%  
Economic interest   40.00% 40.00%  
Impairment of investment in unconsolidated affiliates   $ 51,900    
Cougar | Fair Value        
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated affiliates   4,700 $ 4,700  
Cougar | Carrying Value        
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated affiliates   56,600 56,600  
Petroleum Air Services        
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated affiliates   $ 33,000 $ 33,000 $ 33,000
Ownership percentage in unconsolidated affiliates   25.00% 25.00%  
Lider        
Schedule of Equity Method Investments [Line Items]        
Impairment of investment in unconsolidated affiliates $ 18,700   $ 18,700