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Fair Value Measurements - Contingent Consideration Payable (Details) - Contingent Consideration - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, beginning of period $ 13,889 $ 23,160
Payments of contingent consideration (189) (169)
Change in fair value of contingent consideration 0 (7,616)
Balance, end of period $ 13,700 $ 15,375