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Income Taxes Income Tax Rate Reconciliation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Abstract] |  |  |
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate | $ 33,451 | $ 37,565 | $ 32,506
Income Tax Reconciliation, State and Local Income Taxes | 1,554 | 981 | (213)
Income Tax Reconciliation, Tax Exempt Income | (48) | (104) | (243)
Income Tax Reconciliation, Tax Contingencies | (616) | (1,159) | (1,377)
Income Tax Reconciliation, Other Adjustments | (307) | 115 | (16)
Income Tax Expense (Benefit) | $ 34,034 | $ 37,398 | $ 30,657

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