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Operating Segment Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenue    
Net premiums earned $ 411,386 $ 398,345
Net investment income 42,321 36,726
Net realized gains 9,559 14,912
Net unrealized gains (losses) on equity securities (39,396) (42,318)
Consolidated revenue 423,870 407,665
Less: Expenses    
Losses and settlement expenses 193,244 177,238
Insurance operating expenses 28,280 26,874
Earnings before income taxes 67,341 78,631
Casualty Segment    
Revenue    
Net premiums earned 248,566 229,048
Property Segment    
Revenue    
Net premiums earned 126,378 132,544
Surety Segment    
Revenue    
Net premiums earned 36,442 36,753
Operating Segments    
Revenue    
Net premiums earned 411,386 398,345
Net investment income 42,321 36,726
Net realized gains 9,559 14,912
Net unrealized gains (losses) on equity securities (39,396) (42,318)
Consolidated revenue 423,870 407,665
Less: Expenses    
Earnings before income taxes 57,787 70,546
Operating Segments | Casualty Segment    
Revenue    
Net premiums earned 248,566 229,048
Consolidated revenue 248,566 229,048
Less: Expenses    
Losses and settlement expenses 152,832 145,835
Amortization of deferred acquisition costs 47,482 42,903
Other policy acquisition costs 24,232 22,669
Insurance operating expenses 16,727 15,570
Earnings before income taxes 7,293 2,071
Depreciation and amortization expense 1,597 1,505
Operating Segments | Property Segment    
Revenue    
Net premiums earned 126,378 132,544
Consolidated revenue 126,378 132,544
Less: Expenses    
Losses and settlement expenses 33,854 32,725
Amortization of deferred acquisition costs 25,342 26,976
Other policy acquisition costs 10,813 7,957
Insurance operating expenses 8,184 7,971
Earnings before income taxes 48,185 56,915
Depreciation and amortization expense 538 498
Operating Segments | Surety Segment    
Revenue    
Net premiums earned 36,442 36,753
Consolidated revenue 36,442 36,753
Less: Expenses    
Losses and settlement expenses 6,558 (1,322)
Amortization of deferred acquisition costs 12,735 12,602
Other policy acquisition costs 11,471 10,580
Insurance operating expenses 3,369 3,333
Earnings before income taxes 2,309 11,560
Depreciation and amortization expense 365 310
Corporate    
Revenue    
Net investment income 42,321 36,726
Net realized gains 9,559 14,912
Net unrealized gains (losses) on equity securities $ (39,396) $ (42,318)