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Income Taxes (Components Of The Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Tax Disclosure [Abstract] |  |  |
Federal | $ 74,074 | $ 27,470 | $ 34,255
State | 11,890 | 9,796 | 6,896
Total current income tax expense (benefit) | 85,964 | 37,266 | 41,151
Federal | 14,978 | 39,934 | 6,695
State | 2,704 | 3,414 | 929
Total deferred income tax expense (benefit) | 17,682 | 43,348 | 7,624
Total provision for income taxes | $ 103,646 | $ 80,614 | $ 48,775

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