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Fair Value Measurements (Schedule Of Accumulated Other Comprehensive Loss - Interest Rate Swaps) (Details) (Accumulated other comprehensive loss [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accumulated other comprehensive loss [Member]
Derivative Instruments, Gain (Loss)
Balance at December 31, 2012	$ 48,180
Other comprehensive income	(14,823)
Balance at March 31, 2013	$ 33,357

X

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 10A

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-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Name Accounting Standards Codification

-Topic 220

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- Definition

Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

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