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Income Taxes Income Tax Expense (Benefit), Consolidated Statement of Operations, Differences from Applicable Statutory Federal Income Tax Rate of 35% (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]      
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest $ 85,989 $ 132,914 $ 65,266
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate 30,096 46,520 22,843
Income Tax Reconciliation, Tax Exempt Income (1,876) 0 0
Income Tax Reconciliation, Other Adjustments (29) 146 (510)
Income Tax Expense (Benefit) $ 28,191 $ 46,666 $ 22,333
Effective Income Tax Rate, Continuing Operations 32.80% 35.10% 34.20%