Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
REVENUES	$ 641,884	$ 454,053	$ 497,116
OPERATING EXPENSES:
Cost of Revenues	313,155	217,310	221,347
Corporate technology and production systems	44,323	44,296	44,923
Selling, general and administrative	198,700	122,554	147,198
Depreciation and amortization	82,064	91,199	93,802
Impairments of long-lived assets	3,274	1,797	3,220
Total operating expenses	641,516	477,156	510,490
OPERATING (LOSS) INCOME	368	(23,103)	(13,374)
OTHER EXPENSE (INCOME):
Interest expense, net	30,857	32,947	39,316
(Gain) loss on interest rate swaps	31	9,451	7,324
Other income	(1,532)	(1,646)	(1,529)
Total other expense, net	29,356	40,752	45,111
LOSS BEFORE INCOME TAXES	(28,988)	(63,855)	(58,485)
Income tax benefit	(10,461)	(11,562)	(11,803)
NET LOSS	(18,527)	(52,293)	(46,682)
Unrealized gain (loss) on hedged transactions, net of tax of $0, $273 and $95, respectively	(270)	638	9
Foreign currency translation adjustments, net of tax of $41, $90 and $53, respectively	(694)	1,783	797
Total other comprehensive income (loss)	(964)	2,421	806
COMPREHENSIVE LOSS	$ (19,491)	$ (49,872)	$ (45,876)
Net loss per share attributable to stockholders
Basic (in USD per share)	$ (0.21)	$ (0.59)	$ (0.53)
Diluted (in USD per share)	$ (0.21)	$ (0.59)	$ (0.53)
Weighted average number of shares outstanding
Basic (in shares)	90,218,386	88,345,312	88,154,830
Diluted (in shares)	90,218,386	88,345,312	88,154,830