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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, 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 (6,188) (77,301)
Grants 517 174,530
Redemption value adjustments 8,321 41,636
Foreign translation adjustment 1,549 (4,358)
Ending Balance of contingent payments $ 310,933 $ 306,734