Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue from services	$ 210,288	$ 207,573
Operating expenses:
Direct operating expenses	156,535	154,298
Selling, general and administrative expenses	45,634	47,236
Bad debt expense	199	323
Depreciation and amortization	2,909	2,191
Acquisition-related contingent consideration	213	270
Acquisition and integration costs	115	0
Restructuring costs	435	0
Total operating expenses	206,040	204,318
Income from operations	4,248	3,255
Other expenses (income):
Interest expense	1,266	1,219
Gain on derivative liability	0	(1,581)
Loss on early extinguishment of debt	0	4,969
Other income, net	(101)	0
Income (loss) before income taxes	3,083	(1,352)
Income tax expense	1,163	366
Consolidated net income (loss)	1,920	(1,718)
Less: Net income attributable to noncontrolling interest in subsidiary	278	292
Net income (loss) attributable to common shareholders	$ 1,642	$ (2,010)
Net income (loss) per share attributable to common shareholders - Basic (in dollars per share)	$ 0.05	$ (0.06)
Net income (loss) per share attributable to common shareholders - Diluted (in dollars per share)	$ 0.05	$ (0.08)
Weighted average common shares outstanding:
Basic (shares)	35,803	32,872
Diluted (shares)	36,087	36,480