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Fair Value - Change in Carrying Value Associated with Contingent Payment Arrangements Level 3 Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance as of beginning of period $ 17,589 $ 31,399
Addition 0 11,893
Accretion 460 1,237
Changes in estimates (193) (21,482)
Payments (7,001) (5,458)
Balance as of end of period $ 10,855 $ 17,589