INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Operating reserves	$ 4,642	$ 5,787
Deferred revenue	7,402	9,118
Net operating loss and credit carryforwards	30,395	35,243
Lease liabilities	89,975	6,842
Fixed assets	8,941	12,632
Stock-based compensation	3,599	3,479
Interest limitation	29,205	20,073
Other	2,456	3,938
Valuation allowance	(42,348)	(20,025)
Total deferred tax assets	134,267	77,087
Deferred tax liabilities:
Prepaid expenses	(4,850)	(3,820)
Right-of-use assets	(68,116)
Intangible assets	(91,673)	(100,709)
Convertible senior notes	(1,214)	(3,616)
Total deferred tax liabilities	(165,853)	(108,145)
Net deferred tax liability after valuation allowance	$ (31,586)	$ (31,058)