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Business Segments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
segment
Mar. 31, 2015
USD ($)
Segment Reporting [Abstract]    
Number of reportable business segments | segment 4  
Segment Reporting Information [Line Items]    
Revenue $ 115,756 $ 115,253
Gross Profit 17,927 19,135
Selling, General and Administrative Expense 11,970 11,599
Loss on change in fair value of contingent consideration, net (159) (203)
Operating income 5,798 7,333
Interest expense 245 365
Other income (expense) 454 (225)
Income before income tax expense 6,007 6,743
Learning Solutions [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 9,704 8,347
Professional and Technical Services [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 3,884 6,413
Sandy Training and Marketing [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 2,451 1,976
Performance Readiness Solutions [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 1,888 2,399
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Revenue 115,756 115,253
Operating Segments [Member] | Learning Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue 49,906 51,829
Operating Segments [Member] | Professional and Technical Services [Member]    
Segment Reporting Information [Line Items]    
Revenue 25,829 29,897
Operating Segments [Member] | Sandy Training and Marketing [Member]    
Segment Reporting Information [Line Items]    
Revenue 21,824 14,729
Operating Segments [Member] | Performance Readiness Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue $ 18,197 $ 18,798