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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Financial Information Of Company Operating Segments
  RevenuesExpenses  
(In thousands)Earned
Premiums (1)		Investment
Income
(Loss)		OtherTotal (2)Losses and Loss ExpensesPolicy Acquisition and Insurance Operating ExpensesOtherTotalPre-Tax Income (Loss)Net Income (Loss) to Common Stockholders
Three months ended June 30, 2025
Insurance$2,728,784 $299,476 $10,154 $3,038,414 $1,742,235 $772,328 $11,179 $2,525,742 $512,672 $393,450 
Reinsurance & Monoline Excess369,401 80,858 — 450,259 213,189 109,771 — 322,960 127,299 100,040 
Corporate, other and eliminations (3)— (1,031)152,193 151,162 — — 300,243 300,243 (149,081)(116,490)
Net investment gains— — 30,973 30,973 — — — — 30,973 24,288 
Total$3,098,185 $379,303 $193,320 $3,670,808 $1,955,424 $882,099 $311,422 $3,148,945 $521,863 $401,288 
Three months ended June 30, 2024
Insurance$2,484,569 $303,561 $9,591 $2,797,721 $1,589,569 $707,155 $10,944 $2,307,668 $490,053 $374,247 
Reinsurance & Monoline Excess361,846 58,472 — 420,318 191,027 104,842 — 295,869 124,449 97,638 
Corporate, other and eliminations (3)— 10,096 144,409 154,505 — — 222,822 222,822 (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 $1,780,596 $811,997 $233,766 $2,826,359 $487,673 $371,909 
Six months ended June 30, 2025
Insurance$5,371,291 $590,724 $20,106 $5,982,121 $3,429,688 $1,507,989 $22,267 $4,959,944 $1,022,177 $786,572 
Reinsurance & Monoline Excess739,275 147,288 — 886,563 426,528 212,356 — 638,884 247,679 195,883 
Corporate, other and eliminations (3)— 1,583 300,612 302,195 — — 558,910 558,910 (256,715)(200,710)
Net investment gains— — 47,328 47,328 — — — — 47,328 37,115 
Total$6,110,566 $739,595 $368,046 $7,218,207 $3,856,216 $1,720,345 $581,177 $6,157,738 $1,060,469 $818,860 
Six months ended June 30, 2024
Insurance$4,883,338 $548,338 $19,014 $5,450,690 $3,071,121 $1,389,749 $21,618 $4,482,488 $968,202 $739,337 
Reinsurance & Monoline Excess727,424 111,683 — 839,107 373,253 213,780 — 587,033 252,074 199,764 
Corporate, other and eliminations (3)— 31,946 281,795 313,741 — — 439,540 439,540 (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 $3,444,374 $1,603,529 $461,158 $5,509,061 $1,061,744 $814,380 
Identifiable Assets
(In thousands)June 30,
2025		December 31,
2024
Insurance$34,532,276 $32,911,507 
Reinsurance & Monoline Excess5,799,205 5,669,729 
Corporate, other and eliminations (3)2,326,576 1,867,399 
Consolidated$42,658,057 $40,448,635 
_________________
(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, 2025 and 2024 were $361 million and $368 million, respectively, and for the six months ended June 30, 2025 and 2024 were $694 million and $762 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended June 30, 2025 and 2024 were $116 million and $117 million, respectively, and for the six months ended June 30, 2025 and 2024 were $246 million and $228 million, respectively.
(3) Corporate, other and eliminations represent corporate revenues and expenses and certain other items that are not allocated to business segments
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)2025202420252024
Insurance:
Other liability$1,104,332 $1,001,987 $2,177,060 $1,969,247 
Short-tail lines (1)619,988 538,797 1,216,096 1,049,606 
Auto405,632 361,580 795,581 715,593 
Workers' compensation318,881 310,564 629,910 612,060 
Professional liability279,951 271,641 552,644 536,832 
Total Insurance2,728,784 2,484,569 5,371,291 4,883,338 
Reinsurance & Monoline Excess:
Casualty (2)184,903 199,080 366,670 396,924 
Property (2)113,136 97,255 233,979 199,638 
Monoline excess (3)71,362 65,511 138,626 130,862 
Total Reinsurance & Monoline Excess369,401 361,846 739,275 727,424 
Total$3,098,185 $2,846,415 $6,110,566 $5,610,762 
______________
(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.