Fair Value Measurements and Derivative Instruments - Offsetting of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Offsetting of Financial Assets under Master Netting Agreements [Abstract]
Gross Amount of Derivative Assets Presented in the Consolidated Balance Sheet	$ 296,646	$ 320,385
Gross Amount of Eligible Offsetting Recognized Derivative Liabilities	(91,084)	(104,751)
Cash Collateral Received	0	0
Net Amount of Derivative Assets	205,562	215,634
Offsetting of Financial Liabilities under Master Netting Agreements [Abstract]
Gross Amount of Derivative Liabilities Presented in the Consolidated Balance Sheet	(103,206)	(115,961)
Gross Amount of Eligible Offsetting Recognized Derivative Assets	91,084	104,751
Cash Collateral Pledged	0	0
Net Amount of Derivative Liabilities	$ (12,122)	$ (11,210)

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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