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Business Segments (Financial Information of Company Operating Segments) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | segment     2  
Segment Reporting Information [Line Items]        
Earned Premiums (1) $ 2,641,914 $ 2,441,961 $ 7,686,073 $ 7,048,205
Investment Income  270,944 202,816 739,494 547,902
Other 117,780 79,623 495,989 556,590
Total revenues 3,030,638 2,724,400 8,921,556 8,152,697
Pre-Tax Income (Loss) 419,949 286,265 1,253,205 1,241,260
Net Income (Loss) to Common Stockholders 333,586 228,879 984,020 998,839
Net investment gains (42,426) (67,410) 39,239 127,299
Net investment gains, net of tax (33,021) (52,954) 31,206 100,833
Corporate, other and eliminations        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 0 0 0 0
Investment Income  7,893 13,063 30,787 21,837
Other 151,063 138,692 429,180 403,937
Total revenues 158,956 151,755 459,967 425,774
Pre-Tax Income (Loss) (58,976) (28,198) (253,066) (147,590)
Net Income (Loss) to Common Stockholders (46,226) (23,563) (199,040) (119,530)
Insurance        
Segment Reporting Information [Line Items]        
Earned Premiums (1)   2,129,014   6,162,005
Insurance | Operating Segments        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 2,319,435 2,129,014 6,747,704 6,162,005
Investment Income  206,792 134,519 560,182 386,297
Other 9,143 8,341 27,570 25,354
Total revenues 2,535,370 2,271,874 7,335,456 6,573,656
Pre-Tax Income (Loss) 415,279 322,312 1,153,742 1,052,185
Net Income (Loss) to Common Stockholders 329,519 258,521 903,575 850,207
Insurance | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues 298,000 252,000 852,000 750,000
Reinsurance & Monoline Excess        
Segment Reporting Information [Line Items]        
Earned Premiums (1)   312,947   886,200
Reinsurance & Monoline Excess | Operating Segments        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 322,479 312,947 938,369 886,200
Investment Income  56,259 55,234 148,525 139,768
Other 0 0 0 0
Total revenues 378,738 368,181 1,086,894 1,025,968
Pre-Tax Income (Loss) 106,072 59,561 313,290 209,366
Net Income (Loss) to Common Stockholders 83,314 46,875 248,279 167,329
Reinsurance & Monoline Excess | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues 124,000 117,000 333,000 307,000
Net investment gains        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 0 0 0 0
Investment Income  $ 0 $ 0 $ 0 $ 0