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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Underwriting gain (loss), before federal income tax $ 35,168 $ 32,033 $ 43,777 $ 40,955 $ 49,053 $ 44,831 $ 29,124 $ 26,021      
Net investment income $ 35,428 $ 33,375 $ 31,182 $ 30,769 $ 30,108 $ 32,061 $ 32,230 $ 26,917 $ 130,754 $ 121,316 $ 138,708
Realized investment (losses) gains                 (4,937) 13,171 26,599
Total investment revenues                 125,817 134,487 165,307
Tax on investment income                 30,621 32,090 43,811
Total investment income, after federal income tax                 95,196 102,397 121,496
Standard Commercial Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 146,435 $ 164,496 $ 61,221
GAAP Combined Ratio                 91.20% 89.20% 95.70%
Statutory Combined Ratio                 89.90% 89.20% 95.50%
Standard Personal Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 12,419 $ 1,336 $ 16,536
GAAP Combined Ratio                 95.60% 99.50% 94.40%
Statutory Combined Ratio                 95.20% 99.90% 94.50%
Excess And Surplus Operations [Member]                      
Underwriting gain (loss), before federal income tax                 $ (6,921) $ (16,803) $ 386
GAAP Combined Ratio                 103.40% 109.80% 99.70%
Statutory Combined Ratio                 102.10% 108.40% 99.20%