INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Lease liabilities	$ 82,982	$ 77,879
Compensation	60,160	54,226
Accrued expenses	39,987	23,179
Receivables	7,810	5,086
Tax credit carryforward	10,464	0
Other	8,574	7,417
Deferred tax liabilities:
Right-of-use assets	(77,513)	(75,352)
Intangible assets	(81,210)	(73,166)
Accrued revenue	(18,978)	(14,893)
Prepaid assets	(5,732)	(4,660)
Long-lived assets	(12,722)	(15,134)
Foreign withholding tax	(10,222)	(9,259)
Other	(7,142)	(1,614)
Net deferred tax liabilities	$ (3,542)	$ (26,291)