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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 23, 2017
Oct. 31, 2016
Goodwill [Line Items]          
Goodwill $ 17,531 $ 17,648 $ 13,823    
Amortization expense relating to intangible assets 3,395 3,634 1,800    
Projected amortization expense 2018 3,500        
Projected amortization expense 2019 3,100        
Projected amortization expense 2020 1,700        
Projected amortization expense 2021 700        
Projected amortization expense 2022 700        
Recovery Audit Services – Americas          
Goodwill [Line Items]          
Goodwill 13,420 13,440 10,755    
Adjacent Services          
Goodwill [Line Items]          
Goodwill 2,528 $ 2,528 $ 2,388    
C&CA          
Goodwill [Line Items]          
Goodwill       $ 3,554  
C&CA | Recovery Audit Services – Americas          
Goodwill [Line Items]          
Goodwill $ 3,600        
Lavante          
Goodwill [Line Items]          
Goodwill         $ 2,286