Fair Value Measurement - Quantitative Information Related to Significant Unobservable Inputs Utilized to Calculate Fair Value (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative asset	$ 29,721	$ 4,464
Derivative liability	8,094	$ 12,968
Level 3 \| Derivative Financial Instruments, Liabilities \| Discounted Cash Flow
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative liability	$ (6,687)
Range/Input Value	4.45%
Level 3 \| Derivative Financial Instruments, Assets \| Monte Carlo Simulation Method
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Derivative asset	$ 28,314
Range/Input Value	5.05%

Fair value, after the effects of master netting arrangements, of a 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. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or 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. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 55
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-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

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-Publisher FASB
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Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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