v3.26.1
Operating Segment Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Revenue        
Net premiums earned $ 417,096 $ 401,904 $ 828,482 $ 800,249
Net investment income 46,042 39,418 88,363 76,144
Net realized gains 9,407 15,004 18,966 29,916
Net unrealized gains (losses) on equity securities 103,024 43,500 63,628 1,182
Consolidated revenue 575,569 499,826 999,439 907,491
Less: Expenses        
Losses and settlement expenses 189,895 184,578 383,139 361,816
Insurance operating expenses 32,617 29,594 60,897 56,468
Earnings before income taxes 210,688 156,515 278,029 235,146
Casualty Segment        
Revenue        
Net premiums earned 256,922 234,638 505,488 463,686
Property Segment        
Revenue        
Net premiums earned 123,786 130,664 250,164 263,208
Surety Segment        
Revenue        
Net premiums earned 36,388 36,602 72,830 73,355
Operating Segments        
Revenue        
Net premiums earned 417,096 401,904 828,482 800,249
Net investment income 46,042 39,418 88,363 76,144
Net realized gains 9,407 15,004 18,966 29,916
Net unrealized gains (losses) on equity securities 103,024 43,500 63,628 1,182
Consolidated revenue 575,569 499,826 999,439 907,491
Less: Expenses        
Earnings before income taxes 59,909 62,230 117,696 132,776
Operating Segments | Casualty Segment        
Revenue        
Net premiums earned 256,922 234,638 505,488 463,686
Consolidated revenue 256,922 234,638 505,488 463,686
Less: Expenses        
Losses and settlement expenses 159,686 141,260 312,518 287,095
Amortization of deferred acquisition costs 50,580 45,761 98,062 88,664
Other policy acquisition costs 25,593 22,067 49,825 44,736
Insurance operating expenses 19,321 17,261 36,048 32,831
Earnings before income taxes 1,742 8,289 9,035 10,360
Depreciation and amortization expense 1,559 1,544 3,156 3,049
Operating Segments | Property Segment        
Revenue        
Net premiums earned 123,786 130,664 250,164 263,208
Consolidated revenue 123,786 130,664 250,164 263,208
Less: Expenses        
Losses and settlement expenses 26,725 38,459 60,579 71,184
Amortization of deferred acquisition costs 24,967 26,698 50,309 53,674
Other policy acquisition costs 9,136 7,320 19,949 15,277
Insurance operating expenses 9,459 8,676 17,643 16,647
Earnings before income taxes 53,499 49,511 101,684 106,426
Depreciation and amortization expense 515 521 1,053 1,019
Operating Segments | Surety Segment        
Revenue        
Net premiums earned 36,388 36,602 72,830 73,355
Consolidated revenue 36,388 36,602 72,830 73,355
Less: Expenses        
Losses and settlement expenses 3,484 4,859 10,042 3,537
Amortization of deferred acquisition costs 12,751 12,656 25,486 25,258
Other policy acquisition costs 11,648 11,000 23,119 21,580
Insurance operating expenses 3,837 3,657 7,206 6,990
Earnings before income taxes 4,668 4,430 6,977 15,990
Depreciation and amortization expense 356 359 721 669
Corporate        
Revenue        
Net investment income 46,042 39,418 88,363 76,144
Net realized gains 9,407 15,004 18,966 29,916
Net unrealized gains (losses) on equity securities $ 103,024 $ 43,500 $ 63,628 $ 1,182