INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss (“NOL”) carryforwards	$ 212,315	$ 182,449
Long-term lease liabilities	26,182	29,314
Stock-based compensation	5,390	18,955
Other	35,384	28,637
Total deferred tax assets	279,271	259,355
Less valuation allowance	(66,626)	(77,076)
Net deferred tax assets	212,645	182,279
Deferred tax liabilities:
Intangible assets	(46,591)	(47,858)
Capitalized software, leasehold improvements and equipment	(18,624)	(16,152)
Right-of-use assets	(17,270)	(21,496)
Capitalized costs to obtain a contract with a customer	(9,263)	(12,233)
Other	(87)	(90)
Total deferred tax liabilities	(91,835)	(97,829)
Net deferred tax assets	$ 120,810	$ 84,450