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Fair Value Measurements - Contingent Consideration Payable (Details) - Contingent consideration payable - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance, beginning of period $ 13,166 $ 14,664 $ 15,800 $ 17,358
Payments of contingent consideration (1,000) (1,162) (3,634) (3,856)
Change in fair value of contingent consideration (1,866) 0 (1,866) 0
Balance, end of period $ 10,300 $ 13,502 $ 10,300 $ 13,502