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Business Segments (Tables)
 6 Months Ended
Jun. 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 June 30, 2023
Insurance$2,246,394 $187,304 $8,853 $2,442,551 $386,264 $300,152 
Reinsurance & Monoline Excess306,333 40,210 — 346,543 105,506 82,404 
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 
Three months ended June 30, 2022
Insurance$2,070,157 $114,124 $8,335 $2,192,616 $347,461 $276,133 
Reinsurance & Monoline Excess287,001 57,111 — 344,112 92,177 73,374 
Corporate, other and eliminations (3)— 339 147,375 147,714 (45,521)(36,149)
Net investment losses— — (171,555)(171,555)(171,555)(134,036)
Total$2,357,158 $171,574 $(15,845)$2,512,887 $222,562 $179,322 
Six months ended June 30, 2023
Insurance$4,428,269 $353,390 $18,427 $4,800,086 $738,463 $574,056 
Reinsurance & Monoline Excess615,890 92,266 — 708,156 207,218 164,965 
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 
Six Months Ended June 30, 2022
Insurance$4,032,991 $251,778 $17,012 $4,301,781 $729,873 $591,685 
Reinsurance & Monoline Excess573,253 84,534 — 657,787 149,805 120,454 
Corporate, other and eliminations (3)— 8,774 265,245 274,019 (119,393)(95,966)
Net investment gains— — 194,710 194,710 194,710 153,787 
Total$4,606,244 $345,086 $476,967 $5,428,297 $954,995 $769,960 
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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 June 30, 2023 and 2022 were $280 million and $263 million, respectively, and for the six months ended June 30, 2023 and 2022 were $554 million and $498 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign operations for the three months ended June 30, 2023 and 2022 were $102 million and $93 million, respectively, and for the six months ended June 30, 2023 and 2022 were $209 million and $189 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,
2023		December 31,
2022
Insurance$28,116,467 $27,012,479 
Reinsurance & Monoline Excess5,148,189 5,195,752 
Corporate, other and eliminations2,044,038 1,606,872 
Consolidated$35,308,694 $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 June 30,		For the Six Months
Ended June 30,
(In thousands)2023202220232022
Insurance:
Other liability$893,629 $789,363 $1,750,778 $1,538,754 
Short-tail lines (1)462,554 401,768 893,057 776,980 
Commercial automobile318,421 301,741 629,843 583,975 
Workers' compensation299,149 299,645 604,710 585,067 
Professional liability272,641 277,640 549,881 548,215 
Total Insurance2,246,394 2,070,157 4,428,269 4,032,991 
Reinsurance & Monoline Excess:
Casualty reinsurance188,860 190,659 382,590 374,781 
Monoline excess (2)58,845 54,611 117,489 106,507 
Property reinsurance58,628 41,731 115,811 91,965 
Total Reinsurance & Monoline Excess306,333 287,001 615,890 573,253 
Total$2,552,727 $2,357,158 $5,044,159 $4,606,244 
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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.