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Income Taxes (Reconciliation Of Statutory Federal Income Tax Amount) (Details)

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Income Taxes (Reconciliation Of Statutory Federal Income Tax Amount) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]                        
Income before federal income taxes $ 72,754       $ 26,869         $ 98,199 $ 108,332 $ 47,403
Expected income tax at statutory rate                   34,370 37,916 16,591
State income taxes                   1,493 4,227 2,378
Other differences                   292 (146) (111)
Changes in valuation allowance                   (9,792) (42,087) (18,818)
Total income tax expense (benefit) provision recorded for continuing operations $ 28,195 $ 10,849 $ 15,514 $ 0 $ 0 $ (91) $ 0 $ 1 $ 0 $ 26,363 $ (90) $ 40