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Fair Value Measurements of Assets and Liabilities - Level 3 Contingent Consideration (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in fair value of the Company's Level 3 contingent consideration obligation        
Fair value adjustment to contingent consideration obligation included in net income $ 0 $ (1,349) $ 0 $ 1,766
Level 3 | Contingent Consideration Obligation        
Level 3 changes        
Risk adjusted discount rate     2.19%  
Changes in fair value of the Company's Level 3 contingent consideration obligation        
Balance at December 31, 2016 (Restated)     $ 2,833  
Fair value adjustment to contingent consideration obligation included in net income     (2)  
September 30, 2017 $ 2,831   $ 2,831