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Fair Value Measurements (Details 1) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance of contingent payments $ 119,086 $ 224,754
Payments (48,586) (110,234)
Additions 9,723 0
Redemption value adjustments 2,203 3,273
Foreign translation adjustment (62) 1,293
Ending balance of contingent payments $ 82,364 $ 119,086