AIRCRAFT - Depreciation, Amortization, and Rent Expense on Aircraft (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Amortization	$ 12,536	$ 11,948	$ 13,104
Aircraft Rent	17,653	30,989	49,908
Depreciation amortization and aircraft rent	62,959	69,536	74,877
Owned
Property, Plant and Equipment [Line Items]
Depreciation	33,799	25,294	12,900
Operating leases
Property, Plant and Equipment [Line Items]
Aircraft Rent	$ 17,653	$ 30,989	$ 49,908