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Segment Information (Reconciliation of Segment Results to Income from Continuing Operations, before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total investment revenues $ 385,098 $ 173,347 $ 344,188
Interest expense (28,799) (28,847) (29,165)
Corporate expenses (30,686) (31,116) (28,305)
Income before federal income tax 458,412 280,186 505,310
Preferred stock dividends (9,200) (9,200) (9,353)
Income available to common stockholders, before federal income tax 449,212 270,986 495,957
Standard Commercial Lines [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Underwriting income (loss), before federal income tax 157,306 143,696 198,596
Standard Personal Lines      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Underwriting income (loss), before federal income tax (79,263) (7,193) 3,966
E&S Lines [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Underwriting income (loss), before federal income tax 54,756 30,299 16,030
Operating Segments [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total all segments $ 517,897 $ 340,149 $ 562,780