Intangible Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 125,757
Foreign currency translation	(1,321)
Ending Balance	124,436
Learning Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	53,094
Foreign currency translation	(1,398)
Ending Balance	51,696
Professional and Technical Services [Member]
Goodwill [Roll Forward]
Beginning Balance	44,143
Foreign currency translation	60
Ending Balance	44,203
Sandy [Member]
Goodwill [Roll Forward]
Beginning Balance	653
Foreign currency translation	0
Ending Balance	653
Performance Readiness Group [Member]
Goodwill [Roll Forward]
Beginning Balance	27,867
Foreign currency translation	17
Ending Balance	$ 27,884