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Fair Value Measurements - Contingent Consideration Payable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Change in fair value of contingent consideration     $ (13,500) $ 7,500
Contingent consideration payable        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 14,664 $ 21,911 17,358 8,634
Issuance 0 0 0 18,000
Payments of contingent consideration (1,162) (1,184) (3,856) (1,907)
Purchase accounting adjustment 0 0 0 3,500
Change in fair value of contingent consideration 0 0 0 (7,500)
Balance, end of period $ 13,502 $ 20,727 $ 13,502 $ 20,727