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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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VARIABLE INTEREST ENTITIES AND EQUITY INVESTMENTS AND ADVANCES Era Training Center Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) simulator	Dec. 31, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Proceeds from sale	$ 34,712	$ 1,000
Equity Method Investee \| Training Services
Schedule of Equity Method Investments [Line Items]
Notes Receivable, Principal, Related Parties		3,600
Notes receivable to related party		$ 3,700
Number of flight simulators sold \| simulator		3
Proceeds from sale		$ 2,900
Equity Method Investee \| Additional Simulator
Schedule of Equity Method Investments [Line Items]
Notes receivable to related party		400
Payments for purchase of other assets		400
Era Training Center \| Equity Method Investee \| Helicopter, Management and Other Services
Schedule of Equity Method Investments [Line Items]
Expenses from transactions with related party		100	$ 200
Era Training Center \| Equity Method Investee \| Training Services
Schedule of Equity Method Investments [Line Items]
Expenses from transactions with related party		$ 200	$ 500