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Derivative Financial Instruments (Schedule Of Gain Or Loss On The Hedged Item In The Same Line Item, Other Revenue, As The Offsetting Loss Or Gain On The Related Interest Rate Swaps) (Details) (Other Revenue [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Swaps [Member]
Derivative [Line Items]
Gain (Loss)	$ (4,240)	$ (4,232)	$ (5,922)
Senior Notes [Member]
Derivative [Line Items]
Gain (Loss)	$ 4,240	$ 4,232	$ 5,922

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- Definition

Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration