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Fair Value Measurements (Details 1) - Fair Value, Inputs, Level 3 - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance of contingent payments $ 224,754 $ 306,734
Payments (6,745) (105,169)
Grants 0 16,132
Redemption value adjustments 12,671 13,930
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other Adjustments 0 (6,412)
Foreign translation adjustment 390 (461)
Ending Balance of contingent payments $ 231,070 $ 224,754