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Derivative Financial Instruments - Notional Values (Details) - Interest rate swaps - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 5,076,972 | $ 5,124,951
Trading |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,008,917 | 973,539
Cash Flow Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | 1,110,612 | 1,106,920
Fair Value Hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Notional values | $ 2,957,443 | $ 3,044,492

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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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