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Income Taxes Income Tax Expense or Benefit as Presented in the Consolidated Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statement of Operations      
Current Income Tax Expense (Benefit) $ 80,527 $ 127,535 $ 140,381
Deferred Income Tax Expense (Benefit) (52,336) (80,869) (118,048)
Income Tax Expense (Benefit) 28,191 46,666 22,333
Stockholders' Equity      
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax 123,620 202,143 60,456
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation (392) (1,061) (480)
Income Tax Expense (Benefit), Total Included in Consolidated Financial Statements $ 151,419 $ 247,748 $ 82,309