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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, 2018
 [1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net investment income $ 54,109 $ 52,443 $ 45,553 $ 43,231 $ 42,587 $ 40,446 $ 41,430 $ 37,419 $ 195,336 $ 161,882 $ 130,754
Total net realized and unrealized (losses) gains $ (37,935) [2] $ (4,787) [2] $ (1,652) [2] $ (10,549) [2] $ (1,128) [2] $ 6,798 [2] $ 1,734 [2] $ (1,045) [2] (54,923) 6,359 (4,937)
Total investment revenues                 140,413 168,241 125,817
Tax on investment income                 19,560 45,588 30,621
Total investment income, after federal income tax                 $ 120,853 $ 122,653 $ 95,196
Investments [Member]                      
Return on Equity                 6.90% 7.50% 6.50%
Standard Commercial Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 109,104 $ 149,514 $ 146,435
Underwriting gain (loss), after federal income tax                 $ 86,192 $ 97,184 $ 95,183
Combined Ratio                 94.30% 91.60% 91.20%
Return on Equity                 4.90% 6.10% 6.40%
Standard Personal Lines [Member]                      
Underwriting gain (loss), before federal income tax                 $ 12,764 $ 11,104 $ 12,419
Underwriting gain (loss), after federal income tax                 $ 10,084 $ 7,217 $ 8,072
Combined Ratio                 95.80% 96.20% 95.60%
Return on Equity                 0.60% 0.40% 0.60%
Excess And Surplus Operations [Member]                      
Underwriting gain (loss), before federal income tax                 $ (695) $ (6,282) $ (6,921)
Underwriting gain (loss), after federal income tax                 $ (549) $ (4,083) $ (4,499)
Combined Ratio                 100.30% 103.00% 103.40%
Return on Equity                 0.00% (0.30%) (0.30%)
[1] Results for the fourth quarter of 2017 include the impact of the $20.2 million write off of deferred tax assets required with the implementation of Tax Reform. See Note 13. "Federal Income Taxes" above for additional information.
[2] Effective January 1, 2018, changes in unrealized gains and losses on our equity portfolio are recognized in income through "Net unrealized losses on equity securities" on our Consolidated Statements of Income, as a result of our adoption of ASU 2016-01. See Note 3. "Adoption of Accounting Pronouncements" above.