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Fair Value Measurements and Derivative Instruments - Offsetting of Derivative Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Offsetting of Financial Assets under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet $ 41,633 $ 134,574
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities (41,633) (129,815)
Net Amount of Derivative Assets 0 4,759
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]    
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet (614,150) (1,044,292)
Gross Amount of Eligible Offsetting Recognized Derivative Assets 41,633 129,815
Net Amount of Derivative Liabilities $ (572,517) $ (914,477)