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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
	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