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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract] |  |
Net income | $ 43,181 | $ 29,818
Other comprehensive loss: |  |
Unrealized loss on interest rate swaps | (820) |
Other comprehensive loss, before income taxes | (820) |
Income tax benefit related to items of other comprehensive loss | 303 |
Other comprehensive loss, net of income taxes | (517) |
Comprehensive income | $ 42,664 | $ 29,818

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