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Segment Information (Income From Continuing Operations, Before and After Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net investment income $ 57,594 $ 55,826 $ 58,505 $ 50,618 $ 54,109 $ 52,443 $ 45,553 $ 43,231 $ 222,543 $ 195,336 $ 161,882
Total net realized and unrealized gains (losses) $ (873) $ (2,183) $ 4,027 $ 13,451 $ (37,935) $ (4,787) $ (1,652) $ (10,549) 14,422 (54,923) 6,359
Total investment revenues                 236,965 140,413 168,241
Tax on investment income                 45,301 19,560 45,588
Total investment income, after federal income tax                 191,664 120,853 122,653
Standard Commercial Lines [Member]                      
Underwriting gain (loss), before federal income tax                 145,990 109,104 149,514
Underwriting gain (loss), after federal income tax                 $ 115,332 $ 86,192 $ 97,184
Combined Ratio                 92.90% 94.30% 91.60%
Return on Equity                 5.80% 4.90% 6.10%
Standard Personal Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 8,260 $ 12,764 $ 11,104
Underwriting gain (loss), after federal income tax                 $ 6,525 $ 10,084 $ 7,217
Combined Ratio                 97.30% 95.80% 96.20%
Return on Equity                 0.30% 0.60% 0.40%
E&S Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 9,743 $ (695) $ (6,282)
Underwriting gain (loss), after federal income tax                 $ 7,697 $ (549) $ (4,083)
Combined Ratio                 95.90% 100.30% 103.00%
Return on Equity                 0.40% 0.00% (0.30%)
Investments [Member]                      
Return on Equity                 9.60% 6.90% 7.50%