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Fair Value Measurements (Details 1)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Ending balance of contingent payments $ 144,847
Fair Value, Inputs, Level 3  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Payments 73,358
Additions 0
Redemption value adjustments 19,233
Other (27,118)
Foreign translation adjustment $ 1,336