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Income Taxes Income Tax Expense Detail (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] |  |  |
Current Federal Tax Expense (Benefit) | $ 38,148 | $ 20,460 | $ 40,165
Current State and Local Tax Expense (Benefit) | 1,636 | 2,195 | (1,068)
Current Income Tax Expense (Benefit) | 39,784 | 22,655 | 39,097
Deferred Federal Income Tax Expense (Benefit) | (5,890) | 16,587 | (7,804)
Deferred State and Local Income Tax Expense (Benefit) | 140 | (1,844) | (636)
Deferred Income Tax Expense (Benefit) | (5,750) | 14,743 | (8,440)
Income Tax Expense (Benefit) | $ 34,034 | $ 37,398 | $ 30,657

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