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Industry Segments (Financial Information of Company Operating Segments) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 2    
Earned Premiums $ 10,400,687 $ 9,561,429 $ 8,106,031
Investment Income 1,052,835 779,185 671,618
Net investment gains 47,042 202,397 90,632
Other Revenues 689,416 825,885 677,817
Total revenues 12,142,938 11,166,499 9,455,466
Pre-Tax Income (Loss) 1,754,403 1,719,681 1,282,905
Net investment gains 36,792 159,727 72,922
Net income to common stockholders 1,381,359 1,381,062 1,022,490
Insurance      
Segment Reporting Information [Line Items]      
Earned Premiums 9,130,324 8,369,062 7,077,708
Reinsurance & Monoline Excess      
Segment Reporting Information [Line Items]      
Earned Premiums 1,270,363 1,192,367 1,028,323
Operating Segments | Insurance      
Segment Reporting Information [Line Items]      
Earned Premiums 9,130,324 8,369,062 7,077,708
Investment Income 793,998 550,084 468,821
Other Revenues 36,830 33,347 32,063
Total revenues 9,961,152 8,952,493 7,578,592
Pre-Tax Income (Loss) 1,640,438 1,455,658 1,219,798
Net income to common stockholders 1,291,654 1,173,425 976,184
Operating Segments | Reinsurance & Monoline Excess      
Segment Reporting Information [Line Items]      
Earned Premiums 1,270,363 1,192,367 1,028,323
Investment Income 211,628 194,272 175,324
Other Revenues 0 0 0
Total revenues 1,481,991 1,386,639 1,203,647
Pre-Tax Income (Loss) 438,765 316,527 270,563
Net income to common stockholders 346,782 251,386 215,439
Corporate, other and eliminations      
Segment Reporting Information [Line Items]      
Investment Income 47,209 34,829 27,473
Other Revenues 605,544 590,141 555,122
Total revenues 652,753 624,970 582,595
Pre-Tax Income (Loss) (371,842) (254,901) (298,088)
Net income to common stockholders $ (293,869) $ (203,476) $ (242,055)