REVENUE - Impact of Adoption of Standards (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheets
Accounts receivable, net	$ 324,416				$ 310,169				$ 324,416	$ 310,169
Consolidated Statement of Comprehensive Income (Loss)
Net revenue	720,779	$ 615,880	$ 497,266	$ 476,492	505,730	$ 493,928	$ 479,490	$ 460,643	2,310,417	1,939,791	$ 1,828,046
Provision for doubtful accounts									0	0	(45,602)
Operating loss	13,973	$ (11,725)	$ (8,005)	$ 5,438	13,548	$ 12,759	$ 8,897	$ 3,065	(319)	38,269	27,279
Consolidated Statements of Cash Flows
Accounts receivable, net									82,285	(21,012)	$ (34,003)
Prior to ASC 606 Adoption
Consolidated Balance Sheets
Accounts receivable, net	324,416				310,169				324,416	310,169
Consolidated Statement of Comprehensive Income (Loss)
Net revenue									2,382,058	2,001,132
Provision for doubtful accounts									(71,641)	(61,341)
Operating loss									(319)	38,269
Consolidated Statements of Cash Flows
Accounts receivable, net									82,285	(21,012)
Adjustments for ASC 606 | Adjustments for ASC 606
Consolidated Balance Sheets
Accounts receivable, net	$ 0				$ 0				0	0
Consolidated Statement of Comprehensive Income (Loss)
Net revenue									(71,641)	(61,341)
Provision for doubtful accounts									71,641	61,341
Operating loss									0	0
Consolidated Statements of Cash Flows
Accounts receivable, net									$ 0	$ 0