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Business Segments (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2024
Insurance$2,484,569 $303,561 $9,591 $2,797,721 $490,053 $374,247 
Reinsurance & Monoline Excess361,846 58,472 — 420,318 124,449 97,638 
Corporate, other and eliminations (3)— 10,096 144,409 154,505 (68,317)(53,865)
Net investment losses— — (58,512)(58,512)(58,512)(46,111)
Total$2,846,415 $372,129 $95,488 $3,314,032 $487,673 $371,909 
Three months ended June 30, 2023
Insurance$2,215,186 $185,327 $8,853 $2,409,366 $386,350 $300,239 
Reinsurance & Monoline Excess337,541 42,187 — 379,728 105,420 82,317 
Corporate, other and eliminations (3)— 17,638 130,528 148,166 (93,240)(72,315)
Net investment gains— — 58,654 58,654 58,654 46,067 
Total$2,552,727 $245,152 $198,035 $2,995,914 $457,184 $356,308 
Six months ended June 30, 2024
Insurance$4,883,338 $548,338 $19,014 $5,450,690 $968,202 $739,337 
Reinsurance & Monoline Excess727,424 111,683 — 839,107 252,074 199,764 
Corporate, other and eliminations (3)— 31,946 281,795 313,741 (125,799)(97,757)
Net investment losses— — (32,733)(32,733)(32,733)(26,964)
Total$5,610,762 $691,967 $268,076 $6,570,805 $1,061,744 $814,380 
Six Months Ended June 30, 2023
Insurance$4,358,110 $348,886 $18,427 $4,725,423 $738,977 $574,347 
Reinsurance & Monoline Excess686,049 96,770 — 782,819 206,704 164,674 
Corporate, other and eliminations (3)— 22,895 278,117 301,012 (194,089)(152,814)
Net investment gains— — 81,664 81,664 81,664 64,227 
Total$5,044,159 $468,551 $378,208 $5,890,918 $833,256 $650,434 
_________________
(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 June 30, 2024 and 2023 were $368 million and $280 million, respectively, and for the six months ended June 30, 2024 and 2023 were $762 million and $554 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended June 30, 2024 and 2023 were $117 million and $102 million, respectively, and for the six months ended June 30, 2024 and 2023 were $228 million and $209 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)June 30,
2024		December 31,
2023
Insurance$31,264,338 $29,923,282 
Reinsurance & Monoline Excess5,557,232 5,545,249 
Corporate, other and eliminations2,088,349 1,643,299 
Consolidated$38,909,919 $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 June 30,		For the Six Months
Ended June 30,
(In thousands)2024202320242023
Insurance:
Other liability$1,001,987 $890,984 $1,969,247 $1,744,456 
Short-tail lines (1)538,797 444,834 1,049,606 857,368 
Auto361,580 307,578 715,593 601,694 
Workers' compensation310,564 299,149 612,060 604,710 
Professional liability271,641 272,641 536,832 549,882 
Total Insurance2,484,569 2,215,186 4,883,338 4,358,110 
Reinsurance & Monoline Excess:
Casualty (2)199,080 202,348 396,924 417,060 
Property (2)97,255 76,348 199,638 151,500 
Monoline excess (3)65,511 58,845 130,862 117,489 
Total Reinsurance & Monoline Excess361,846 337,541 727,424 686,049 
Total$2,846,415 $2,552,727 $5,610,762 $5,044,159 
______________
(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.