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Business Segments (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
practice_area
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
reporting_unit
segment
practice_area
Jun. 30, 2017
USD ($)
Segment Reporting [Abstract]        
Number of reportable business segments | segment     2  
Segment Reporting Information [Line Items]        
Revenue $ 133,691 $ 131,161 $ 258,723 $ 253,608
Gross Profit 22,573 22,435 40,252 41,823
General and administrative expenses 14,121 12,777 27,980 25,376
Sales and marketing expenses 1,106 461 1,831 856
Restructuring charges 2,495 0 2,930 0
Gain (loss) on change in fair value of contingent consideration, net 894 (96) 3,446 101
Operating income 5,745 9,101 10,957 15,692
Interest expense (150) 534 536 972
Other income (expense) (988) (107) (1,152) (182)
Income before income tax expense $ 4,907 8,460 $ 9,269 14,538
Number of reporting units | reporting_unit     4  
Number of practice areas | practice_area 4   4  
Workforce Excellence [Member]        
Segment Reporting Information [Line Items]        
Gross Profit $ 15,009 14,035 $ 26,118 27,042
Number of practice areas | practice_area 2   2  
Business Transformation Services [Member]        
Segment Reporting Information [Line Items]        
Gross Profit $ 7,564 8,400 $ 14,134 14,781
Number of practice areas | practice_area 2   2  
Operating Segments        
Segment Reporting Information [Line Items]        
Revenue $ 133,691 131,161 $ 258,723 253,608
Operating Segments | Workforce Excellence [Member]        
Segment Reporting Information [Line Items]        
Revenue 80,256 76,032 154,687 147,575
Operating Segments | Business Transformation Services [Member]        
Segment Reporting Information [Line Items]        
Revenue $ 53,435 $ 55,129 $ 104,036 $ 106,033