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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, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance as of beginning of period $ 10,855 $ 17,589
Addition 0 0
Accretion 210 460
Changes in estimates (2,429) (193)
Payments (1,300) (7,001)
Balance as of end of period $ 7,336 $ 10,855