Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
Beginning Balance	$ 125,757
Foreign currency translation	(3,087)
Ending Balance	122,670
Learning Solutions [Member]
Goodwill [Roll Forward]
Beginning Balance	53,094
Foreign currency translation	(2,596)
Ending Balance	50,498
Professional and Technical Services [Member]
Goodwill [Roll Forward]
Beginning Balance	44,143
Foreign currency translation	(425)
Ending Balance	43,718
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	(66)
Ending Balance	$ 27,801