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Business Segments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Segment Reporting [Abstract]    
Number of reportable business segments | segment 4  
Segment Reporting Information [Line Items]    
Revenue $ 122,447 $ 115,756
Gross Profit 19,388 17,927
Selling, General and Administrative Expense 12,994 11,970
Gain (loss) on change in fair value of contingent consideration, net 197 (159)
Operating income 6,591 5,798
Interest expense 438 245
Other income (expense) (75) 454
Income before income tax expense 6,078 6,007
Learning Solutions [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 8,756 9,704
Professional and Technical Services [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 4,599 3,884
Sandy Training and Marketing [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 2,876 2,451
Performance Readiness Solutions [Member]    
Segment Reporting Information [Line Items]    
Gross Profit 3,157 1,888
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Revenue 122,447 115,756
Operating Segments [Member] | Learning Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue 49,746 49,906
Operating Segments [Member] | Professional and Technical Services [Member]    
Segment Reporting Information [Line Items]    
Revenue 25,309 25,829
Operating Segments [Member] | Sandy Training and Marketing [Member]    
Segment Reporting Information [Line Items]    
Revenue 24,601 21,824
Operating Segments [Member] | Performance Readiness Solutions [Member]    
Segment Reporting Information [Line Items]    
Revenue $ 22,791 $ 18,197