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Derivative Instruments - Income statement disclosures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Net gain on the valuation of contingent value rights $ 0 $ 8,620 $ 0 $ 33,420