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Derivative Instruments - Income statement disclosures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain on the valuation of contingent value rights $ 0 $ 6,940 $ 0 $ 40,360