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Business Segments (Financial Information of Company Operating Segments) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
segment
Jun. 30, 2023
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | segment     2  
Segment Reporting Information [Line Items]        
Earned Premiums (1) $ 2,846,415 $ 2,552,727 $ 5,610,762 $ 5,044,159
Investment Income  372,129 245,152 691,967 468,551
Other 95,488 198,035 268,076 378,208
Total revenues 3,314,032 2,995,914 6,570,805 5,890,918
Pre-Tax Income (Loss) 487,673 457,184 1,061,744 833,256
Net Income (Loss) to Common Stockholders 371,909 356,308 814,380 650,434
Net investment gains (58,512) 58,654 (32,733) 81,664
Net investment gains, net of tax (46,111) 46,067 (26,964) 64,227
Corporate, other and eliminations        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 0 0 0 0
Investment Income  10,096 17,638 31,946 22,895
Other 144,409 130,528 281,795 278,117
Total revenues 154,505 148,166 313,741 301,012
Pre-Tax Income (Loss) (68,317) (93,240) (125,799) (194,089)
Net Income (Loss) to Common Stockholders (53,865) (72,315) (97,757) (152,814)
Insurance        
Segment Reporting Information [Line Items]        
Earned Premiums (1)   2,215,186   4,358,110
Insurance | Operating Segments        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 2,484,569 2,215,186 4,883,338 4,358,110
Investment Income  303,561 185,327 548,338 348,886
Other 9,591 8,853 19,014 18,427
Total revenues 2,797,721 2,409,366 5,450,690 4,725,423
Pre-Tax Income (Loss) 490,053 386,350 968,202 738,977
Net Income (Loss) to Common Stockholders 374,247 300,239 739,337 574,347
Insurance | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues 368,000 280,000 762,000 554,000
Reinsurance & Monoline Excess        
Segment Reporting Information [Line Items]        
Earned Premiums (1)   337,541   686,049
Reinsurance & Monoline Excess | Operating Segments        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 361,846 337,541 727,424 686,049
Investment Income  58,472 42,187 111,683 96,770
Other 0 0 0 0
Total revenues 420,318 379,728 839,107 782,819
Pre-Tax Income (Loss) 124,449 105,420 252,074 206,704
Net Income (Loss) to Common Stockholders 97,638 82,317 199,764 164,674
Reinsurance & Monoline Excess | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues 117,000 102,000 228,000 209,000
Net investment gains        
Segment Reporting Information [Line Items]        
Earned Premiums (1) 0 0 0 0
Investment Income  $ 0 $ 0 $ 0 $ 0