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
3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated affiliates $ 56,175 $ 77,058
Petroleum Air Services    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage in unconsolidated affiliates 25.00%  
Investment in unconsolidated affiliates $ 33,000 $ 33,000
Lider    
Schedule of Equity Method Investments [Line Items]    
Impairment of investment in unconsolidated affiliates $ 18,700