Acquisitions (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	$ 3,797
Additions (Payments)	3,325
Change in Fair Value of Contingent Consideration	(1,392)
Foreign Currency Translation	(647)
Ending balance of liability	5,083
Bath Consulting [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	997
Additions (Payments)	(1,005)
Change in Fair Value of Contingent Consideration	0
Foreign Currency Translation	8
Ending balance of liability	0
Prospero [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	1,841
Additions (Payments)	0
Change in Fair Value of Contingent Consideration	(1,796)
Foreign Currency Translation	(45)
Ending balance of liability	0
Lorien [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	959
Additions (Payments)	(1,015)
Change in Fair Value of Contingent Consideration	31
Foreign Currency Translation	25
Ending balance of liability	0
Effective Companies [Member]
Change in Contingent Consideration [Roll Forward]
Beginning balance of liability	0
Additions (Payments)	5,345
Change in Fair Value of Contingent Consideration	373
Foreign Currency Translation	(635)
Ending balance of liability	$ 5,083