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Business Segments (Tables)
 6 Months Ended
Jun. 30, 2021
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, 2021
Insurance$1,727,202 $116,703 $8,212 $1,852,117 $291,290 $230,313 
Reinsurance & Monoline Excess244,422 46,879 — 291,301 74,794 59,334 
Corporate, other and eliminations (3)— 4,605 124,000 128,604 (90,208)(71,209)
Net investment gains— — 24,064 24,064 24,064 18,800 
Total$1,971,624 $168,187 $156,276 $2,296,086 $299,940 $237,238 
Three months ended June 30, 2020
Insurance$1,465,044 $44,105 $8,018 $1,517,167 $76,546 $48,607 
Reinsurance & Monoline Excess211,871 23,461 — 235,332 12,566 10,689 
Corporate, other and eliminations (3)— 17,865 87,777 105,642 (61,548)(47,823)
Net investment gains— — 77,885 77,885 77,885 59,787 
Total$1,676,915 $85,431 $173,680 $1,936,026 $105,449 $71,260 
Six months ended June 30, 2021
Insurance$3,332,181 $221,941 $16,490 $3,570,612 $548,399 $429,022 
Reinsurance & Monoline Excess489,399 84,587 — 573,986 143,443 113,806 
Corporate, other and eliminations (3)— 20,236 229,218 249,454 (154,737)(123,817)
Net investment gains— — 58,903 58,903 58,903 47,752 
Total$3,821,580 $326,764 $304,611 $4,452,955 $596,008 $466,763 
Six Months Ended June 30, 2020
Insurance$2,949,999 $167,564 $16,490 $3,134,053 $252,493 $185,467 
Reinsurance & Monoline Excess418,334 61,171 — 479,505 49,080 39,877 
Corporate, other and eliminations (3)— 31,459 200,907 232,366 (103,302)(81,689)
Net investment losses— — (99,289)(99,289)(99,289)(76,813)
Total$3,368,333 $260,194 $118,108 $3,746,635 $98,982 $66,842 
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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 countries for the three months ended June 30, 2021 and 2020 were $221 million and $149 million, respectively, and for the six months ended June 30, 2021 and 2020 were $418 million and $317 million, respectively. Revenues for Reinsurance & Monoline Excess from foreign countries for the three months ended June 30, 2021 and 2020 were $90 million and $65 million, respectively, and for the six months ended June 30, 2021 and 2020 were $178 million and $134 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,
2021		December 31,
2020
Insurance$22,771,988 $21,702,328 
Reinsurance & Monoline Excess4,670,226 4,654,158 
Corporate, other and eliminations2,855,703 2,215,479 
Consolidated$30,297,917 $28,571,965 
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)2021202020212020
Insurance:
Other liability$638,404 $544,465 $1,240,306 $1,091,594 
Short-tail lines (1)339,890 295,968 664,630 591,446 
Workers' compensation291,471 278,699 558,920 580,299 
Commercial automobile237,444 190,335 458,205 379,978 
Professional liability219,993 155,577 410,120 306,682 
Total Insurance1,727,202 1,465,044 3,332,181 2,949,999 
Reinsurance & Monoline Excess:
Casualty reinsurance152,531 130,459 302,169 253,190 
Monoline excess (2)48,247 41,062 94,120 83,224 
Property reinsurance43,644 40,350 93,110 81,920 
Total Reinsurance & Monoline Excess244,422 211,871 489,399 418,334 
Total$1,971,624 $1,676,915 $3,821,580 $3,368,333 
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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.