INCOME TAXES - Deferred Income Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Price concessions	$ 12,302	$ 14,879
Compensation and benefits	3,672	1,925
Interest limitation carryforward	38,623	3,486
Operating lease liability	19,462	1,640
Net operating losses	147,749	10,155
Other	5,506	3,644
Deferred tax assets before valuation allowance	227,314	35,729
Valuation allowance	(109,531)	(1,373)	$ (1,263)	$ (765)
Deferred tax assets net of valuation allowance	117,783	34,356
Deferred tax liabilities:
Accelerated depreciation	(10,376)	(9,483)
Operating lease right-of-use asset	(15,442)
Intangible assets	(71,204)	(39,977)
Goodwill	(20,250)	(14,700)
Other	(2,654)	(3,677)
Deferred tax liabilities	(119,926)	(67,837)
Net deferred tax liabilities	$ (2,143)	$ (33,481)