Stockholders' Equity (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net, beginning balance	$ (72,954)	$ (105,085)	$ (83,902)
Other comprehensive income (loss) before reclassification	(45,512)	6,260	(46,984)
Amounts reclassified from accumulated other comprehensive loss, net	35,459	25,871	25,801
Accumulated other comprehensive loss, net, ending balance	(83,007)	(72,954)	(105,085)
Accumulated other comprehensive loss, tax benefit	6,701	10,829	27,413	12,602
Other comprehensive loss before reclassification - interest rate swap contracts, tax expense (benefit)		40	30,946
Amounts reclassified from AOCI - interest rate swap contracts, tax expense		16,544	16,135
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net, beginning balance	(18,436)	(24,634)	(27,135)
Other comprehensive income (loss) before reclassification	(16,273)	6,198	2,501
Accumulated other comprehensive loss, net, ending balance	(34,709)	(18,436)	(24,634)
Unrealized losses on interest rate swap contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net, beginning balance	(54,518)	(80,451)	(56,767)
Other comprehensive income (loss) before reclassification	(29,239)	62	(49,485)
Amounts reclassified from accumulated other comprehensive loss, net	35,459	25,871	25,801
Accumulated other comprehensive loss, net, ending balance	(48,298)	(54,518)	(80,451)
Other comprehensive loss before reclassification - interest rate swap contracts, tax expense (benefit)	19,405
Amounts reclassified from AOCI - interest rate swap contracts, tax expense	$ 23,533

Accumulated other comprehensive loss, tax benefit

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

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

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-Name Regulation S-X (SX)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's 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 12

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and 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

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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