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Income Taxes (Provision For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]      
Federal, Current $ 797,406 $ 499,535 $ 30,999
State, Current 135,148 91,316 4,473
Federal, Deferred 70,671 (9,679) 21,796
State, Deferred 24,737 819 2,044
Income tax provision total $ 1,027,962 $ 581,991 $ 59,312