Annual report pursuant to Section 13 and 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 5 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Schedule of Equity Method Investments [Line Items]        
Investment in unconsolidated affiliates   $ 4,530 $ 77,058 $ 4,530
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
Impairment not recognized due to cash basis of accounting   $ 8,600    
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]        
Economic interest   25.00%   25.00%
Cost method investment   $ 33,000   $ 33,000
Lider        
Schedule of Equity Method Investments [Line Items]        
Impairment of investment in unconsolidated affiliates $ 18,700   $ 9,600 $ 18,700