Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
REVENUES	$ 169,557	$ 117,602	$ 468,255	$ 325,550
OPERATING EXPENSES:
Cost of revenues (exclusive of depreciation and amortization below)	82,638	55,112	225,798	153,458
Corporate technology and production systems	12,084	10,842	32,435	32,922
Selling, general and administrative	84,983	25,391	153,194	86,848
Depreciation and amortization	20,346	22,863	61,193	68,441
Impairments of long-lived assets	15	621	2,940	680
Total operating expenses	200,066	114,829	475,560	342,349
OPERATING INCOME (LOSS)	(30,509)	2,773	(7,305)	(16,799)
OTHER EXPENSE (INCOME):
Interest expense, net	7,668	7,817	22,841	25,110
(Gain) loss on interest rate swaps	112	(49)	199	9,604
Other income	(400)	(336)	(1,034)	(998)
Total other expense, net	7,380	7,432	22,006	33,716
LOSS BEFORE INCOME TAXES	(37,889)	(4,659)	(29,311)	(50,515)
Income tax provision (benefit)	(12,633)	5,727	(8,080)	718
NET LOSS	(25,256)	(10,386)	(21,231)	(51,233)
Unrealized gain (loss) on hedged transactions, net of tax	(1)	231	(323)	231
Foreign currency translation adjustments, net of tax	(1,565)	1,000	(971)	(955)
Total other comprehensive income (loss)	(1,566)	1,231	(1,294)	(724)
COMPREHENSIVE LOSS	$ (26,822)	$ (9,155)	$ (22,525)	$ (51,957)
Net loss per share attributable to stockholders, Basic	$ (0.28)	$ (0.12)	$ (0.24)	$ (0.58)
Net loss per share attributable to stockholders, Diluted	$ (0.28)	$ (0.12)	$ (0.24)	$ (0.58)
Weighted average number of shares outstanding, Basic	89,431,022	88,332,134	88,956,388	88,325,838
Weighted average number of shares outstanding, Diluted	89,431,022	88,332,134	88,956,388	88,325,838