Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 155,399								$ 583,290	$ 515,160	$ 509,208
Cost of revenue									494,077	437,417	427,181
Gross profit	23,309	$ 21,667	$ 22,959	$ 21,278	$ 18,292	$ 19,199	$ 22,573	$ 17,679	89,213	77,743	82,027
General and administrative expenses									64,492	54,848	55,753
Sales and marketing expenses									7,875	4,798	1,666
Restructuring charges									1,639	2,930	3,317
Gain on change in fair value of contingent consideration, net									677	4,438	1,620
Gain on sale of business									12,126	0	0
Operating income									28,010	19,605	22,911
Interest expense									6,058	2,945	3,132
Other income (expense) (including interest income of $50 in 2019, $8 in 2018 and $43 in 2017)									417	(1,897)	(90)
Income before income taxes									22,369	14,763	19,689
Income tax expense									7,180	4,927	6,798
Net income	$ 9,495	$ 2,141	$ 3,219	$ 334	$ 385	$ 3,244	$ 3,575	$ 2,632	$ 15,189	$ 9,836	$ 12,891
Basic weighted average shares outstanding (in shares)									16,827	16,608	16,748
Diluted weighted average shares outstanding (in shares)									16,861	16,696	16,873
Per common share data:
Basic earnings per share (in dollars per share)	$ 0.56	$ 0.13	$ 0.19	$ 0.02	$ 0.02	$ 0.20	$ 0.22	$ 0.16	$ 0.90	$ 0.59	$ 0.77
Diluted earnings per share (in dollars per share)	$ 0.56	$ 0.13	$ 0.19	$ 0.02	$ 0.02	$ 0.20	$ 0.22	$ 0.16	$ 0.90	$ 0.59	$ 0.76