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Derivatives (Details) (USD $) |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2014 Interest rate swaps maturing March 2015 [Member] | Sep. 30, 2013 Interest rate swaps maturing March 2015 [Member] | Sep. 30, 2014 Interest rate swaps maturing June 2017 [Member] | Sep. 30, 2013 Interest rate swaps maturing June 2017 [Member] | Sep. 30, 2014 Interest rate swaps maturing November 2018 [Member] | Sep. 30, 2014 Interest rate swaps maturing June 2019 [Member] | Sep. 30, 2014 Interest rate swaps maturing September 2019 [Member]
Summary Of Derivative Instruments And Hedged Items [Abstract] |  |  |  |  |  |  |  |  |
Issuance date |  |  | Feb. 24, 2011 |  | May 24, 2011 |  | Nov. 12, 2013 | Feb. 25, 2014 | May 06, 2014
Maturity date |  |  | Mar. 02, 2015 |  | Jun. 01, 2017 |  | Nov. 15, 2018 | Jun. 01, 2019 | Sep. 03, 2019
Face value of medium - term notes |  |  | $ 350,000,000 |  | $ 350,000,000 |  | $ 300,000,000 | $ 350,000,000 | $ 400,000,000
Aggregate notional amount of interest rate swaps | $ 600,000,000 | $ 400,000,000 | $ 150,000,000 |  | $ 150,000,000 |  | $ 100,000,000 | $ 100,000,000 | $ 100,000,000
Fixed interest rate |  |  | 3.15% |  | 3.50% |  | 2.45% | 2.55% | 2.45%
Weighted-average variable interest rate on hedged debt |  |  | 1.28% | 1.34% | 1.42% | 1.51% | 1.18% | 1.10% | 0.86%

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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 Derivative weighted average variable interest rate on hedge item. + References No definition available. + Details
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- 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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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