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Business Segments (Financial Information of Company Operating Segments) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
segment
Sep. 30, 2024
USD ($)
Segment Reporting [Abstract]        
Number of reportable segments | segment     2  
Number of operating segments | segment     3  
Segment Reporting Information [Line Items]        
Premiums Earned, Net $ 3,156,382 $ 2,926,823 $ 9,266,948 $ 8,537,585
Investment Income 351,238 323,756 1,090,833 1,015,723
Other 260,616 149,800 628,662 417,876
Total revenues 3,768,236 3,400,379 10,986,443 9,971,184
Net Income (Loss) to Common Stockholders 511,032 365,634 1,329,892 1,180,014
Net investment gains 78,960 (8,086) 126,288 (40,818)
Net investment gains, net of tax 61,987 (8,043) 99,102 (35,008)
Income before income taxes 648,110 474,449 1,708,579 1,536,192
Policyholder Benefits and Claims Incurred, Net 1,968,857 1,825,960 5,825,073 5,270,334
Policy Acquisition And Insurance Operating Expenses 900,312 835,376 2,620,657 2,438,905
Other segment amount 250,957 264,594 832,134 725,753
Total 3,120,126 2,925,930 9,277,864 8,434,992
Net investment gains (losses) 78,960 (8,086) 126,288 (40,818)
Corporate Reconciling Items And Eliminations        
Segment Reporting Information [Line Items]        
Investment Income 19,069 13,485 20,652 45,429
Other 171,619 148,697 472,230 430,492
Total revenues 190,688 162,182 492,882 475,921
Net Income (Loss) to Common Stockholders (39,593) (72,008) (240,302) (169,764)
Income before income taxes (49,396) (92,111) (306,111) (217,912)
Other segment amount 240,084 254,293 798,993 693,833
Total 240,084 254,293 798,993 693,833
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Income before income taxes 78,960 (8,086) 126,288 (40,818)
Net investment gains (losses) 78,960      
Insurance        
Segment Reporting Information [Line Items]        
Premiums Earned, Net   2,564,490   7,447,828
Insurance | Operating Segments        
Segment Reporting Information [Line Items]        
Premiums Earned, Net 2,773,009 2,564,490 8,144,300 7,447,828
Investment Income 260,547 253,234 851,271 801,573
Other 10,037 9,189 30,144 28,202
Total revenues 3,043,593 2,826,913 9,025,715 8,277,603
Net Income (Loss) to Common Stockholders 375,577 363,026 1,162,148 1,102,363
Income before income taxes 474,538 469,421 1,496,715 1,437,623
Policyholder Benefits and Claims Incurred, Net 1,772,377 1,619,281 5,202,065 4,690,402
Policy Acquisition And Insurance Operating Expenses 785,805 727,910 2,293,794 2,117,658
Other segment amount 10,873 10,301 33,141 31,920
Total 2,569,055 2,357,492 7,529,000 6,839,980
Insurance | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues 357,000 350,000 1,051,000 1,112,000
Reinsurance & Monoline Excess        
Segment Reporting Information [Line Items]        
Premiums Earned, Net   362,333   1,089,757
Reinsurance & Monoline Excess | Operating Segments        
Segment Reporting Information [Line Items]        
Premiums Earned, Net 383,373 362,333 1,122,648 1,089,757
Investment Income 71,622 57,037 218,910 168,721
Other 0 0 0 0
Total revenues 454,995 419,370 1,341,558 1,258,478
Net Income (Loss) to Common Stockholders 113,061 82,659 308,944 282,423
Income before income taxes 144,008 105,225 391,687 357,299
Policyholder Benefits and Claims Incurred, Net 196,480 206,679 623,008 579,932
Policy Acquisition And Insurance Operating Expenses 114,507 107,466 326,863 321,247
Total 310,987 314,145 949,871 901,179
Reinsurance & Monoline Excess | Operating Segments | Non-US        
Segment Reporting Information [Line Items]        
Total revenues $ 136,000 $ 125,000 $ 382,000 $ 353,000