Acquisitions (Details 2) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	$ 5,258
2016 Additions	5,613
2016 Payments	(5,065)
Change in Fair Value of Contingent Consideration	(1,620)
Foreign Currency Translation	39
Ending balance of liability	4,225
Maverick Solutions [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	5,258
2016 Additions	0
2016 Payments	(4,098)
Change in Fair Value of Contingent Consideration	819
Foreign Currency Translation	0
Ending balance of liability	1,979
McKinney Rogers [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	0
2016 Additions	4,505
2016 Payments	(967)
Change in Fair Value of Contingent Consideration	(2,037)
Foreign Currency Translation	0
Ending balance of liability	1,501
Emantras [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	0
2016 Additions	220
2016 Payments	0
Change in Fair Value of Contingent Consideration	(144)
Foreign Currency Translation	0
Ending balance of liability	76
CLS [Member] [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	0
2016 Additions	888
2016 Payments	0
Change in Fair Value of Contingent Consideration	(258)
Foreign Currency Translation	39
Ending balance of liability	$ 669