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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, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance of contingent payments $ 224,754 $ 306,734
Payments (84,733) (105,169)
Additions 0 16,132
Redemption value adjustments 18,534 13,930
Other 0 (6,412)
Foreign translation adjustment 945 (461)
Ending balance of contingent payments $ 159,500 $ 224,754