Annual report pursuant to Section 13 and 15(d)

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

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Income Taxes Income Taxes (Reconciliation of Statutory Federal Income Tax Amount) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]                      
Income from continuing operations before federal income taxes                 $ 251,328 $ 98,199 $ 108,332
Expected income tax at statutory rate                 87,965 34,370 37,916
State income taxes                 9,297 1,493 4,227
Other differences                 874 292 (146)
Changes in valuation allowance                 0   (42,087)
Income tax expense (benefit) recorded for continuing operations $ 21,027 $ 23,400 $ 25,514 $ 28,195 $ 10,849 $ 15,514 $ 0 $ 0 $ 98,136 $ 26,363 $ (90)