Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) segment	Sep. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable business segments | segment			4
Segment Reporting Information [Line Items]
Revenue	$ 122,931	$ 123,869	$ 363,849	$ 376,667
Gain (loss) on change in fair value of contingent consideration, net	(56)	655	(314)	1,513
Operating income	6,865	11,310	22,212	32,239
Restructuring Charges	1,195	0	1,195	0
Interest expense	340	117	1,011	399
Other income (expense)	(606)	(72)	(1,141)	185
Income before income tax expense	5,919	11,121	20,060	32,025
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue	122,931	123,869	363,849	376,667
Operating Segments [Member] | Learning Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	51,879	49,638	154,463	143,578
Operating income	4,815	3,300	11,637	8,049
Operating Segments [Member] | Professional and Technical Services [Member]
Segment Reporting Information [Line Items]
Revenue	30,354	36,138	90,317	118,364
Operating income	2,731	4,426	9,716	16,577
Operating Segments [Member] | Sandy Training and Marketing [Member]
Segment Reporting Information [Line Items]
Revenue	22,115	15,883	62,043	50,364
Operating income	150	1,023	1,481	3,204
Operating Segments [Member] | Performance Readiness Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	18,583	22,210	57,026	64,361
Operating income	$ 420	$ 1,906	$ 887	$ 2,896