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Fair Value Measurement and Derivative Instruments - Offsetting of Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Offsetting of Financial Assets under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet $ 57,937 $ 188,576
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities (57,937) (91,627)
Net Amount of Derivative Assets 0 96,949
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet (275,036) (100,260)
Gross Amount of Eligible Offsetting Recognized Derivative Assets 57,937 91,627
Net Amount of Derivative Liabilities $ (217,099) $ (8,633)