INCOME TAXES - Deferred Income Taxes - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Provision for accrued expenses	$ 5,405	$ 4,907
Leasing	27,419	24,864
Net operating loss carryforwards	66,977	56,190
Non-cash compensation expense	26,756	20,746
Intangible assets	15,222	12,684
Interest limitation	8,036	4,059
Contingent liabilities	0	4,507
Tax credits	15,848	13,656
Other	1,079	3,605
Total gross deferred tax assets	166,742	145,218
Less: valuation allowance	(6,039)	(5,802)	$ (4,102)	$ (2,229)
Total deferred tax assets, net of the valuation allowance	160,703	139,416
Deferred tax liabilities:
Leasing	(24,590)	(21,632)
Property and equipment	(8,156)	(5,015)
Equity investment	(25,608)	0
Other	(444)	(653)
Total gross deferred tax liabilities	(58,798)	(27,300)
Net deferred taxes	101,905	$ 112,116
Federal
Deferred tax liabilities:
Operating loss carryforwards	220,100
State
Deferred tax liabilities:
State operating loss carryforwards	$ 542,700