Derivative Financial Instruments - Location of Hedged Liabilities (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Long-term debt
Derivative [Line Items]
Carrying Amount of Hedged Assets (Liabilities)	$ (2,242,904)
Cumulative Amount of Fair Value Hedging Adjustments Included in the Carrying Amount of Hedged Assets (Liabilities)	45,030
Interest rate swaps
Derivative [Line Items]
Notional Value	$ 2,300,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

Accumulated Change In Unrealized Gain (Loss) On Fair Value Hedging Instruments

+ References

No definition available.

+ Details

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- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ 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.

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- Details

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- Details

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