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Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income, before federal income tax $ 53,643 $ 47,656 $ 180,244 $ 124,239
Interest expense (7,397) (6,073) (26,289) (18,350)
Corporate expenses (6,369) (7,450) (28,345) (22,065)
Income before federal income tax 71,178 67,130 235,097 159,586
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 30,016 26,333 92,974 74,153
Standard Personal Lines [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax (631) 3,158 7,074 6,457
Excess And Surplus Operations [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Underwriting gain (loss), before federal income tax 1,916 3,506 9,439 (4,848)
Operating Segments [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total income, before federal income tax all segments $ 84,944 $ 80,653 $ 289,731 $ 200,001