Derivatives (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Interest rate swaps maturing June 2017 [Member]
Summary Of Derivative Instruments And Hedged Items [Abstract]
Issuance date	May 01, 2011
Maturity date	Jun. 01, 2017
Face value of medium - term notes	$ 350,000
Aggregate notional amount of interest rate swaps	150,000
Fixed interest rate	3.50%
Weighted-average variable interest rate on hedged debt	1.83%	1.50%
Interest rate swaps maturing March 2015 [Member]
Summary Of Derivative Instruments And Hedged Items [Abstract]
Issuance date	Feb. 01, 2011
Maturity date	Mar. 01, 2015
Face value of medium - term notes	350,000
Aggregate notional amount of interest rate swaps	150,000
Fixed interest rate	3.15%
Weighted-average variable interest rate on hedged debt	1.66%	1.43%
Interest rate swaps maturing March 2013 [Member]
Summary Of Derivative Instruments And Hedged Items [Abstract]
Issuance date	Feb. 01, 2008
Maturity date	Mar. 01, 2013
Face value of medium - term notes	250,000
Aggregate notional amount of interest rate swaps	$ 250,000
Fixed interest rate	6.00%
Weighted-average variable interest rate on hedged debt	2.84%	2.61%

Monetary 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

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Derivative weighted average variable interest rate on hedge item.

No definition available.

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Data Type:	num:percentItemType
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Period Type:	instant

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

No definition available.

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Fixed interest rate related to the interest rate derivative.

No definition available.

Name:	us-gaap_DerivativeFixedInterestRate
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The date the entity entered into the derivative.

No definition available.

Name:	us-gaap_DerivativeInceptionDates
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

The date the derivative matures.

No definition available.

Name:	us-gaap_DerivativeMaturityDates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration