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Fair Value Measurements (Details 1) (Fair Value, Inputs, Level 3 [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
   
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance of contingent payments $ 151,848 $ 194,795
Payments (3,965) (106,460)
Grants 46,088 31,608
Redemption value adjustments 9,415 38,712
Transfers (to) from fixed payments (5,146) (6,318)
Foreign translation adjustment (270) (489)
Ending Balance of contingent payments $ 197,970 $ 151,848