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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, 2016
Dec. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance of contingent payments $ 306,734 $ 172,227
Payments (81,702) (77,301)
Grants 514 174,530
Redemption value adjustments 8,880 41,636
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Other Adjustments (6,412) 0
Foreign translation adjustment 1,813 (4,358)
Ending Balance of contingent payments $ 229,827 $ 306,734