Intangible Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 1,750
Goodwill [Roll Forward]
Beginning Balance	121,975
Foreign currency translation	331
Ending Balance	124,056
Learning Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	1,750
Goodwill [Roll Forward]
Beginning Balance	49,822
Foreign currency translation	587
Ending Balance	52,159
Professional and Technical Services [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]
Beginning Balance	43,702
Foreign currency translation	(215)
Ending Balance	43,487
Sandy [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]
Beginning Balance	653
Foreign currency translation	0
Ending Balance	653
Performance Readiness Group [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	0
Goodwill [Roll Forward]
Beginning Balance	27,798
Foreign currency translation	(41)
Ending Balance	$ 27,757