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Fair Value Measurement and Derivative Instruments - Offsetting of Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 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 $ 80,112 $ 188,576
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities (42,808) (91,627)
Net Amount of Derivative Assets 37,304 96,949
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet (74,431) (100,260)
Gross Amount of Eligible Offsetting Recognized Derivative Assets 42,808 91,627
Net Amount of Derivative Liabilities $ (31,623) $ (8,633)