Goodwill & Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill	$ 137,392	$ 141,174
Accumulated Impairment losses	(15,417)	(15,417)
Total	121,975	125,757
Acquisitions	9,939
Foreign currency translation	(4,142)	(3,782)
Goodwill	143,189	137,392
Accumulated impairment losses	(15,417)	(15,417)
Total	127,772	121,975
Learning Solutions [Member]
Goodwill [Roll Forward]
Goodwill	51,901	55,173
Accumulated Impairment losses	(2,079)	(2,079)
Total	49,822	53,094
Acquisitions	1,828
Foreign currency translation	(2,571)	(3,272)
Goodwill	51,158	51,901
Accumulated impairment losses	(2,079)	(2,079)
Total	49,079	49,822
Professional and Technical Services [Member]
Goodwill [Roll Forward]
Goodwill	51,532	51,973
Accumulated Impairment losses	(7,830)	(7,830)
Total	43,702	44,143
Acquisitions	0
Foreign currency translation	(1,338)	(441)
Goodwill	50,194	51,532
Accumulated impairment losses	(7,830)	(7,830)
Total	42,364	43,702
Sandy Training and Marketing [Member]
Goodwill [Roll Forward]
Goodwill	6,161	6,161
Accumulated Impairment losses	(5,508)	(5,508)
Total	653	653
Acquisitions	0
Foreign currency translation	0	0
Goodwill	6,161	6,161
Accumulated impairment losses	(5,508)	(5,508)
Total	653	653
Performance Readiness Group [Member]
Goodwill [Roll Forward]
Goodwill	27,798	27,867
Accumulated Impairment losses	0	0
Total	27,798	27,867
Acquisitions	8,111
Foreign currency translation	(233)	(69)
Goodwill	35,676	27,798
Accumulated impairment losses	0	0
Total	$ 35,676	$ 27,798