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 6 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]      
Investment in unconsolidated affiliates   $ 56,924 $ 77,058
Cougar      
Schedule of Equity Method Investments [Line Items]      
Voting interest   25.00%  
Economic interest   40.00%  
Petroleum Air Services      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage in unconsolidated affiliates   25.00%  
Investment in unconsolidated affiliates   $ 33,000  
Lider      
Schedule of Equity Method Investments [Line Items]      
Impairment of investment in unconsolidated affiliates $ 18,700 $ 18,700