CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenue from services	$ 833,537	$ 767,421	$ 617,825
Operating expenses:
Direct operating expenses	611,802	570,056	460,021
Selling, general, and administrative expenses	179,820	161,275	141,018
Bad debt expense	593	999	1,016
Depreciation	4,168	3,856	3,866
Amortization	5,014	4,210	3,575
Loss on sale of business	0	2,184	0
Acquisition-related contingent consideration	814	0	0
Acquisition and integration costs	78	902	7,957
Restructuring costs	753	1,274	840
Impairment charges	24,311	2,100	10,000
Total operating expenses	827,353	746,856	628,293
Income (loss) from operations	6,184	20,565	(10,468)
Other expenses (income):
Interest expense	6,106	6,810	4,160
(Gain) loss on derivative liability	(5,805)	9,901	16,671
Loss on early extinguishment of debt	1,568	0	0
Other (income) expense, net	(230)	(306)	19
Income (loss) before income taxes	4,545	4,160	(31,318)
Income tax (benefit) expense	(4,186)	(794)	216
Consolidated net income (loss)	8,731	4,954	(31,534)
Less: Net income attributable to noncontrolling interest in subsidiary	764	536	249
Net income (loss) attributable to common shareholders	$ 7,967	$ 4,418	$ (31,783)
Net income (loss) per share attributable to common shareholders - Basic (usd per share)	$ 0.25	$ 0.14	$ (1.02)
Net income (loss) per share attributable to common shareholders - Diluted (usd per share)	$ 0.15	$ 0.14	$ (1.02)
Weighted average common shares outstanding—basic (shares)	32,132	31,514	31,190
Weighted average common shares outstanding—diluted (shares)	36,246	32,162	31,190