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Derivative Financial Instruments - Notional Values (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Notional values | $ 6,400,000 |
Interest rate swaps |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 6,405,020 | $ 5,459,075
Interest rate swaps | Derivatives Not Designated as Hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,161,000 | 987,577
Interest rate swaps | Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,376,816 | 1,408,649
Interest rate swaps | Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 3,867,204 | 3,062,849
Other |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 5,476 | 3,245
Other | Derivatives Not Designated as Hedges |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 5,476 | 3,245
Other | Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 0 | 0
Other | Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 0 | $ 0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition 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. + References No definition available. + Details
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