CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue from services	$ 822,224	$ 816,484	$ 865,048
Operating expenses:
Direct operating expenses	618,215	606,921	636,462
Selling, general and administrative expenses	181,959	180,230	187,435
Bad debt expense	2,008	2,204	1,828
Depreciation and amortization	14,075	11,780	10,174
Acquisition-related contingent consideration	(110)	2,557	44
Acquisition and integration costs	311	491	1,975
Restructuring costs	3,571	2,758	1,026
Legal settlement charges	1,600	0	0
Impairment charges	16,306	22,423	14,356
Total operating expenses	837,935	829,364	853,300
(Loss) income from operations	(15,711)	(12,880)	11,748
Other expenses (income):
Interest expense	5,306	5,654	4,214
Loss (gain) on derivatives	1,284	0	(1,581)
Loss on early extinguishment of debt	1,978	79	4,969
Other income, net	(68)	(418)	(155)
(Loss) income before income taxes	(24,211)	(18,195)	4,301
Income tax expense (benefit)	31,732	(2,478)	(34,501)
Consolidated net (loss) income	(55,943)	(15,717)	38,802
Less: Net income attributable to noncontrolling interest in subsidiary	1,770	1,234	1,289
Net (loss) income attributable to common shareholders	$ (57,713)	$ (16,951)	$ 37,513
Net (loss) income per share attributable to common shareholders - Basic (usd per share)	$ (1.61)	$ (0.48)	$ 1.07
Net (loss) income per share attributable to common shareholders - Diluted (usd per share)	$ (1.61)	$ (0.48)	$ 1.01
Weighted average common shares outstanding—basic (shares)	35,815	35,657	35,018
Weighted average common shares outstanding—diluted (shares)	35,815	35,657	36,166