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Business Segments (Tables)
 9 Months Ended
Sep. 30, 2023
Segment Reporting [Abstract]  
Financial Information Of Company Operating Segments
  Revenues  
(In thousands)Earned
Premiums (1)		Investment
Income 		OtherTotal (2)Pre-Tax Income (Loss)Net Income (Loss) to Common Stockholders
Three months ended September 30, 2023
Insurance$2,319,435 $206,792 $9,143 $2,535,370 $415,279 $329,519 
Reinsurance & Monoline Excess322,479 56,259 — 378,738 106,072 83,314 
Corporate, other and eliminations (3)— 7,893 151,063 158,956 (58,976)(46,226)
Net investment losses— — (42,426)(42,426)(42,426)(33,021)
Total$2,641,914 $270,944 $117,780 $3,030,638 $419,949 $333,586 
Three months ended September 30, 2022
Insurance$2,129,014 $134,519 $8,341 $2,271,874 $322,312 $258,521 
Reinsurance & Monoline Excess312,947 55,234 — 368,181 59,561 46,875 
Corporate, other and eliminations (3)— 13,063 138,692 151,755 (28,198)(23,563)
Net investment losses— — (67,410)(67,410)(67,410)(52,954)
Total$2,441,961 $202,816 $79,623 $2,724,400 $286,265 $228,879 
Nine months ended September 30, 2023
Insurance$6,747,704 $560,182 $27,570 $7,335,456 $1,153,742 $903,575 
Reinsurance & Monoline Excess938,369 148,525 — 1,086,894 313,290 248,279 
Corporate, other and eliminations (3)— 30,787 429,180 459,967 (253,066)(199,040)
Net investment gains— — 39,239 39,239 39,239 31,206 
Total$7,686,073 $739,494 $495,989 $8,921,556 $1,253,205 $984,020 
Nine months ended September 30, 2022
Insurance$6,162,005 $386,297 $25,354 $6,573,656 $1,052,185 $850,207 
Reinsurance & Monoline Excess886,200 139,768 — 1,025,968 209,366 167,329 
Corporate, other and eliminations (3)— 21,837 403,937 425,774 (147,590)(119,530)
Net investment gains— — 127,299 127,299 127,299 100,833 
Total$7,048,205 $547,902 $556,590 $8,152,697 $1,241,260 $998,839 
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(1) Certain amounts included in earned premiums of each segment are related to inter-segment transactions.
(2) Revenues for Insurance from foreign operations for the three months ended September 30, 2023 and 2022 were $298 million and $252 million, respectively, and for the nine months ended September 30, 2023 and 2022 were $852 million and $750 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended September 30, 2023 and 2022 were $124 million and $117 million, respectively, and for the nine months ended September 30, 2023 and 2022 were $333 million and $307 million, respectively.(3) Corporate, other and eliminations represent corporate revenues and expenses that are not allocated to business segments
Identifiable Assets By Segment
(In thousands)September 30,
2023		December 31,
2022
Insurance$28,862,050 $27,012,479 
Reinsurance & Monoline Excess5,194,783 5,195,752 
Corporate, other and eliminations2,054,515 1,606,872 
Consolidated$36,111,348 $33,815,103 
Net Premiums Earned By Major Line Of Business Net premiums earned by major line of business are as follows:
 For the Three Months
Ended September 30,		For the Nine Months
Ended September 30,
(In thousands)2023202220232022
Insurance:
Other liability$918,054 $824,595 $2,668,831 $2,363,349 
Short-tail lines (1)490,598 407,211 1,383,654 1,184,191 
Commercial automobile335,572 307,754 965,416 891,729 
Workers' compensation300,694 307,323 905,405 892,390 
Professional liability274,517 282,131 824,398 830,346 
Total Insurance2,319,435 2,129,014 6,747,704 6,162,005 
Reinsurance & Monoline Excess:
Casualty reinsurance192,071 193,726 574,660 568,507 
Monoline excess (2)60,363 54,675 177,853 161,181 
Property reinsurance70,045 64,546 185,856 156,512 
Total Reinsurance & Monoline Excess322,479 312,947 938,369 886,200 
Total$2,641,914 $2,441,961 $7,686,073 $7,048,205 
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(1) Short-tail lines include commercial multi-peril (non-liability), inland marine, accident and health, fidelity and surety, boiler and machinery and other lines.
(2) Monoline excess includes operations that solely retain risk on an excess basis.