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Segment Information (Reconciliation of Segment Results to Income Before Federal Income Tax (Details)) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Investment income, before federal income tax $ 32,947 $ 28,810 $ 61,012 $ 74,610
Interest expense (5,620) (5,612) (11,226) (11,216)
General corporate and other expenses (8,793) (5,557) (20,332) (15,484)
Income before federal income tax 62,311 46,765 114,186 103,055
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 40,173 35,241 71,105 65,277
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 6,125 (4,655) 14,730 (7,121)
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 (2,521) (1,462) (1,103) (3,011)
Operating Segments [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Total all segments $ 76,724 $ 57,934 $ 145,744 $ 129,755