Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue from services	$ 204,572	$ 209,313	$ 414,860	$ 416,886
Operating expenses:
Direct operating expenses	150,883	152,785	307,418	307,083
Selling, general and administrative expenses	45,284	46,600	90,918	93,836
Bad debt expense	611	326	810	649
Depreciation and amortization	2,963	2,285	5,872	4,476
Acquisition-related contingent consideration	220	281	433	551
Acquisition and integration costs	76	587	191	587
Restructuring costs	193	0	628	0
Total operating expenses	200,230	202,864	406,270	407,182
Income from operations	4,342	6,449	8,590	9,704
Other expenses (income):
Interest expense	1,447	535	2,713	1,754
Gain on derivative liability	0	0	0	(1,581)
Loss on early extinguishment of debt	0	0	0	4,969
Other income, net	(98)	(59)	(199)	(59)
Income before income taxes	2,993	5,973	6,076	4,621
Income tax expense	1,169	753	2,332	1,119
Consolidated net income	1,824	5,220	3,744	3,502
Less: Net income attributable to noncontrolling interest in subsidiary	285	370	563	662
Net income attributable to common shareholders	$ 1,539	$ 4,850	$ 3,181	$ 2,840
Net income per share attributable to common shareholders - Basic (in dollars per share)	$ 0.04	$ 0.14	$ 0.09	$ 0.08
Net income per share attributable to common shareholders - Diluted (in dollars per share)	$ 0.04	$ 0.13	$ 0.09	$ 0.05
Weighted average common shares outstanding:
Basic (shares)	35,652	35,651	35,727	34,269
Diluted (shares)	35,832	36,021	35,959	36,250