XML 138 R108.htm IDEA: XBRL DOCUMENT v3.25.0.1
Segment Information - Schedule of Segments Pre and After Tax Income, Significant Expenses and Reconciliations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Revenue from External Customer [Line Items]      
Total revenues $ 4,861,664 $ 4,232,106 $ 3,558,062
(Favorable)/unfavorable prior year casualty reserve development 285,271 9,954 (78,890)
Current year casualty loss costs 2,879,213 2,474,331 2,190,668
Net 3,164,484 2,484,285 2,111,778
Income before federal income tax 258,034 458,412 280,186
Total federal income tax expense (51,022) (93,174) (55,300)
Net income 207,012 365,238 224,886
Interest expense (28,878) (28,799) (28,847)
Corporate expenses (34,602) (30,686) (31,116)
Preferred stock dividends (9,200) (9,200) (9,200)
Net income available to common stockholders 197,812 356,038 215,686
Total Insurance Operations      
Revenue from External Customer [Line Items]      
Net 3,164,484 2,484,285 2,111,778
Dividends to policyholders 6,504 6,755 4,858
Standard Commercial Lines      
Revenue from External Customer [Line Items]      
Total revenues 3,475,950 3,088,952 2,749,338
Net 2,501,615 1,919,204 1,683,988
Dividends to policyholders 6,504 6,755 4,858
Standard Personal Lines      
Revenue from External Customer [Line Items]      
Total revenues 427,483 367,414 301,221
Net 364,601 353,185 231,113
E&S Lines      
Revenue from External Customer [Line Items]      
Total revenues 504,129 390,642 334,156
Net 298,268 211,896 196,677
Operating Segments      
Revenue from External Customer [Line Items]      
Total revenues 4,861,664 4,232,106 3,558,062
Net catastrophe losses 284,503 244,510 145,926
Non-catastrophe property loss and loss expense 681,607 650,384 617,870
Net 3,164,484 2,484,285 2,111,778
Commissions to distribution partners 780,799 680,185 604,200
Salaries and employee benefits 353,451 328,005 297,512
Other segment expenses 234,912 214,979 199,565
Total net underwriting expenses incurred 1,369,162 1,223,169 1,101,277
Dividends to policyholders 6,504 6,755 4,858
Income before federal income tax 321,514 517,897 340,149
Total federal income tax expense (65,972) (106,257) (66,874)
Net income 255,542 411,640 273,275
Operating Segments | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 311,000 (6,500) (86,000)
Current year casualty loss costs 1,887,374 1,595,891 1,433,982
Operating Segments | Total Insurance Operations      
Revenue from External Customer [Line Items]      
Total revenues 4,407,562 3,847,008 3,384,715
Net catastrophe losses 284,503 244,510 145,926
Non-catastrophe property loss and loss expense 681,607 650,384 617,870
Net 3,164,484 2,484,285 2,111,778
Commissions to distribution partners 780,799 680,185 604,200
Salaries and employee benefits 353,451 328,005 297,512
Other segment expenses 234,912 214,979 199,565
Total net underwriting expenses incurred 1,369,162 1,223,169 1,101,277
Dividends to policyholders 6,504 6,755 4,858
Income before federal income tax (132,588) 132,799 166,802
Total federal income tax expense 27,843 (27,888) (35,028)
Net income (104,745) 104,911 131,774
Operating Segments | Total Insurance Operations | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 311,000 (6,500) (86,000)
Current year casualty loss costs 1,887,374 1,595,891 1,433,982
Operating Segments | Standard Commercial Lines      
Revenue from External Customer [Line Items]      
Total revenues 3,475,950 3,088,952 2,749,338
Net catastrophe losses 181,546 150,518 95,600
Non-catastrophe property loss and loss expense 459,537 461,593 461,119
Net 2,501,615 1,919,204 1,683,988
Commissions to distribution partners 639,180 571,078 515,938
Salaries and employee benefits 290,880 267,375 245,339
Other segment expenses 182,754 167,234 155,519
Total net underwriting expenses incurred 1,112,814 1,005,687 916,796
Dividends to policyholders 6,504 6,755 4,858
Income before federal income tax (144,983) 157,306 143,696
Net income  
Operating Segments | Standard Commercial Lines | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 286,000 (15,500) (81,000)
Current year casualty loss costs 1,574,532 1,322,593 1,208,269
Operating Segments | Standard Personal Lines      
Revenue from External Customer [Line Items]      
Total revenues 427,483 367,414 301,221
Net catastrophe losses 79,965 69,315 40,759
Non-catastrophe property loss and loss expense 164,045 156,890 117,125
Net 364,601 353,185 231,113
Commissions to distribution partners 30,270 22,052 13,379
Salaries and employee benefits 37,024 38,830 34,045
Other segment expenses 35,073 32,610 29,877
Total net underwriting expenses incurred 102,367 93,492 77,301
Dividends to policyholders 0 0 0
Income before federal income tax (39,485) (79,263) (7,193)
Net income  
Operating Segments | Standard Personal Lines | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 5,000 14,000 0
Current year casualty loss costs 115,591 112,980 73,229
Operating Segments | E&S Lines      
Revenue from External Customer [Line Items]      
Total revenues 504,129 390,642 334,156
Net catastrophe losses 22,992 24,677 9,567
Non-catastrophe property loss and loss expense 58,025 31,901 39,626
Net 298,268 211,896 196,677
Commissions to distribution partners 111,349 87,055 74,883
Salaries and employee benefits 25,547 21,800 18,128
Other segment expenses 17,085 15,135 14,169
Total net underwriting expenses incurred 153,981 123,990 107,180
Dividends to policyholders 0 0 0
Income before federal income tax 51,880 54,756 30,299
Net income  
Operating Segments | E&S Lines | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 20,000 (5,000) (5,000)
Current year casualty loss costs 197,251 160,318 152,484
Operating Segments | Investments      
Revenue from External Customer [Line Items]      
Total revenues 454,102 385,098 173,347
Net catastrophe losses 0 0 0
Non-catastrophe property loss and loss expense 0 0 0
Net 0 0 0
Commissions to distribution partners 0 0 0
Salaries and employee benefits 0 0 0
Other segment expenses 0 0 0
Total net underwriting expenses incurred 0 0 0
Dividends to policyholders 0 0 0
Income before federal income tax 454,102 385,098 173,347
Total federal income tax expense (93,815) (78,369) (31,846)
Net income 360,287 306,729 141,501
Operating Segments | Investments | Casualty lines      
Revenue from External Customer [Line Items]      
(Favorable)/unfavorable prior year casualty reserve development 0 0 0
Current year casualty loss costs 0 0 0
Reconciling Item, Corporate      
Revenue from External Customer [Line Items]      
Total federal income tax expense $ 14,950 $ 13,083 $ 11,574