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Income Taxes Income Taxes (Income Tax Reconciliation) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Income before income taxes $ 123,157 $ 85,570 $ 28,537
Federal income tax expense at statutory rate 43,105 29,950 9,988
State income taxes, net of federal income tax benefits 6,444 1,121 261
Non-deductible expenses 1,974 1,491 1,682
Impact of domestic production deduction (4,256) (654) (1,201)
Tax credits 0 (25) (833)
Equity and other adjustments 0 0 0
Changes in valuation allowance, net of equity and tax audit adjustments 870 (397) (6,166)
Income tax expense $ 48,137 $ 31,486 $ 3,731