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Business Segments (Tables)
 3 Months Ended
Mar. 31, 2024
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 March 31, 2024
Insurance$2,398,768 $244,778 $9,423 $2,652,969 $478,149 $365,091 
Reinsurance & Monoline Excess365,579 53,211 — 418,790 127,624 102,126 
Corporate, other and eliminations (3)— 21,850 137,384 159,234 (57,482)(43,893)
Net investment gains— — 25,780 25,780 25,780 19,147 
Total$2,764,347 $319,839 $172,587 $3,256,773 $574,071 $442,471 
Three months ended March 31, 2023
Insurance$2,142,924 $163,558 $9,577 $2,316,059 $352,626 $274,108 
Reinsurance & Monoline Excess348,508 54,583 — 403,091 101,285 82,357 
Corporate, other and eliminations (3)— 5,257 147,587 152,844 (100,850)(80,499)
Net investment gains— — 23,010 23,010 23,010 18,160 
Total$2,491,432 $223,398 $180,174 $2,895,004 $376,071 $294,126 
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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 March 31, 2024 and 2023 were $393 million and $274 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended March 31, 2024 and 2023 were $111 million and $106 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)March 31,
2024		December 31,
2023
Insurance$30,048,006 $29,923,282 
Reinsurance & Monoline Excess5,506,533 5,545,249 
Corporate, other and eliminations2,296,533 1,643,299 
Consolidated$37,851,072 $37,111,830 
Net Premiums Earned By Major Line Of Business Net premiums earned by major line of business are as follows:
 For the Three Months
Ended March 31,
(In thousands)20242023
Insurance:
Other liability$967,260 $853,472 
Short-tail lines (1)510,809 412,534 
Auto354,013 294,116 
Workers' compensation301,495 305,561 
Professional liability265,191 277,241 
Total Insurance2,398,768 2,142,924 
Reinsurance & Monoline Excess:
Casualty (2)197,844 214,712 
Property (2)102,384 75,152 
Monoline excess (3)65,351 58,644 
Total Reinsurance & Monoline Excess365,579 348,508 
Total$2,764,347 $2,491,432 
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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, high net worth homeowners and other lines.
(2) Includes reinsurance casualty and property and certain program management business.
(3) Monoline excess includes operations that solely retain risk on an excess basis.