CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue from Contract with Customer, Product and Service [Extensible List]	Service	Service	Service
Revenue from services	$ 1,676,652	$ 836,417	$ 822,224
Operating expenses:
Direct operating expenses	1,301,653	633,685	618,215
Selling, general and administrative expenses	215,292	173,809	181,959
Bad debt expense	4,783	3,035	2,008
Depreciation and amortization	9,852	12,671	14,075
Acquisition and integration-related costs	1,068	77	201
Restructuring costs	2,630	6,052	3,571
Legal settlement charges	0	0	1,600
Impairment charges	2,070	16,248	16,306
Total operating expenses	1,537,348	845,577	837,935
Income (loss) from operations	139,304	(9,160)	(15,711)
Other expenses (income):
Interest expense	6,866	2,890	5,306
Loss on derivative	0	0	1,284
Loss on early extinguishment of debt	0	0	1,978
Other (income) expense, net	(770)	280	(68)
Income (loss) before income taxes	133,208	(12,330)	(24,211)
Income tax expense (benefit)	1,206	(188)	31,732
Consolidated net income (loss)	132,002	(12,142)	(55,943)
Less: Net income attributable to noncontrolling interest in subsidiary	0	820	1,770
Net income (loss) attributable to common stockholders	$ 132,002	$ (12,962)	$ (57,713)
Net income (loss) per share attributable to common stockholders - Basic (usd per share)	$ 3.60	$ (0.36)	$ (1.61)
Net loss per share attributable to common stockholders - Diluted (usd per share)	$ 3.53	$ (0.36)	$ (1.61)
Weighted average common shares outstanding:
Basic (shares)	36,689	36,088	35,815
Diluted (shares)	37,392	36,088	35,815