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Segment Information (Reconciliation of Segment Results to Income from Continuing Operations, before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Total investment revenues                 $ 222,890 $ 236,965 $ 140,413
Interest expense                 (30,839) (33,668) (24,419)
Corporate expenses                 (25,412) (30,900) (25,446)
Income before federal income tax $ 159,041 $ 85,257 $ 42,693 $ 15,997 $ 101,293 $ 71,178 $ 90,225 $ 73,694 302,988 336,390 211,721
Standard Commercial Lines [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax                 151,731 145,990 109,104
Standard Personal Lines                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax                 (15,508) 8,260 12,764
E&S Lines [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Underwriting gain (loss), before federal income tax                 126 9,743 (695)
Operating Segments [Member]                      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]                      
Total all segments                 $ 359,239 $ 400,958 $ 261,586