Intangible Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 127,772
Acquisitions	3,515
Foreign currency translation	451
Ending Balance	131,738
Learning Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	49,079
Acquisitions	0
Foreign currency translation	359
Ending Balance	49,438
Professional and Technical Services [Member]
Goodwill [Roll Forward]
Beginning Balance	42,364
Acquisitions	0
Foreign currency translation	79
Ending Balance	42,443
Sandy Training and Marketing [Member]
Goodwill [Roll Forward]
Beginning Balance	653
Acquisitions	0
Foreign currency translation	0
Ending Balance	653
Performance Readiness Group [Member]
Goodwill [Roll Forward]
Beginning Balance	35,676
Acquisitions	3,515
Foreign currency translation	13
Ending Balance	$ 39,204