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Fair Value Measurements (Details 3) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 63,900,000 $ 34,800,000
Changes in fair value 6,800,000 29,100,000
Purchases, sales and settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Ending balance 70,700,000 63,900,000
Transfers $ 0 $ 0