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Long-Term Debt And Cash Flow Hedges (Cash Flow Hedges) (Narrative 2) (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2012 | Mar. 31, 2012 Interest Rate Cap [Member] | Dec. 31, 2007 Interest Rate Swaps [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap From December 15, 2011 To December 15, 12012 [Member] | Mar. 31, 2011 Forward Starting Interest Rate Cap From December 15, 2012 To December 15, 2014 [Member] | Mar. 31, 2012 Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2012 1.91% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2012 2.50% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2012 1.96% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2012 1.32% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2010 2.38% Forward Starting Interest Rate Swaps [Member] | Dec. 31, 2007 4.76% Forward Starting Interest Rate Swaps [Member] | Mar. 31, 2012 Other Current Liabilities [Member] | Mar. 31, 2012 Other Noncurrent Liabilities [Member]
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total notional amount of interest rate cash flow hedges |  |  | $ 75,000,000 |  | $ 450,000,000 | $ 400,000,000 | $ 425,000,000 | $ 225,000,000 | $ 100,000,000 | $ 25,000,000 | $ 75,000,000 | $ 600,000,000 |  |  |
Interest rate percentage above which counterparty agrees to pay the difference |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |
Premium paid on interest rate cap |  |  |  | 740,000 |  |  |  |  |  |  |  |  |  |  |
Maturity date of interest rate cash flow hedges |  | Dec. 01, 2011 |  |  |  |  |  |  | Dec. 01, 2014 | Dec. 01, 2013 | Dec. 01, 2012 | May 01, 2015 | Oct. 01, 2012 |  |
Fixed rate payable on interest rate swap |  |  |  |  |  |  |  | 1.91% | 2.50% | 1.96% | 1.32% | 2.38% | 4.76% |  |
Fair value of our interest rate swaps, liability | $ 46,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 | $ 44,000,000

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