Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue		$ 115,594	$ 106,144	$ 128,281	$ 155,399	$ 139,005	$ 149,413	$ 139,473	$ 473,107	$ 583,290	$ 515,160
Total gross profit	$ 23,086	$ 20,665	$ 15,897	$ 17,614	$ 23,309	$ 21,667	$ 22,959	$ 21,278	77,262	89,213	77,743
General and Administrative Expense									62,694	64,492	54,848
Sales and marketing expenses									7,190	7,875	4,798
Restructuring charges									1,387	1,639	2,930
Gain (loss) on change in fair value of contingent consideration, net									0	(677)	(4,438)
Gain on sale of business									6,064	12,126	0
Operating income									12,055	28,010	19,605
Interest expense									(2,934)	(6,058)	(2,945)
Other income (expense)									(511)	417	(1,897)
Income before income tax expense									8,610	22,369	14,763
North America
Segment Reporting Information [Line Items]
Revenue									317,735	395,603	366,481
Total gross profit									59,258	64,343	56,434
EMEA
Segment Reporting Information [Line Items]
Revenue									107,203	125,118	116,296
Total gross profit									11,532	14,916	15,246
Emerging Markets
Segment Reporting Information [Line Items]
Revenue									48,169	62,569	32,383
Total gross profit									$ 6,472	$ 9,954	$ 6,063