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Segment Information (Income From Continuing Operations, Before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Underwriting gain (loss), before federal income tax $ 49,053 $ 44,831 $ 29,124 $ 26,021 $ 38,637 $ 34,437 $ 10,084 $ (5,015)      
Net investment income $ 30,108 $ 32,061 $ 32,230 $ 26,917 $ 32,108 $ 34,292 $ 36,774 $ 35,534 $ 121,316 $ 138,708 $ 134,643
Net realized investment gains                 13,171 26,599 20,732
Total investment revenues                 134,487 165,307 155,375
Tax on investment income                 32,090 43,811 40,489
Total investment income, after federal income tax                 102,397 121,496 114,886
Standard Commercial Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 164,496 $ 61,221 $ 33,856
GAAP Combined Ratio                 89.20% 95.70% 97.40%
Statutory Combined Ratio                 89.20% 95.50% 97.10%
Standard Personal Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 1,336 $ 16,536 $ 8,645
GAAP Combined Ratio                 99.50% 94.40% 97.10%
Statutory Combined Ratio                 99.90% 94.50% 96.90%
Excess And Surplus Operations [Member]                      
Underwriting gain (loss), before federal income tax                 $ (16,803) $ 386 $ (3,735)
GAAP Combined Ratio                 109.80% 99.70% 103.00%
Statutory Combined Ratio                 108.40% 99.20% 102.90%