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Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments [Abstract] |
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments |
|  | At June 30, 2021
|  | Amortized |  | Allowance for |  | Unrealized |  | Unrealized |  | Market
(Dollars in thousands) | Cost |  | Credit Losses |  | Appreciation |  | Depreciation |  | Value
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government agencies and corporations | $ | 1,259,149 |  | $ | - |  | $ | 29,365 |  | $ | (12,756) |  | $ | 1,275,758
| Obligations of U.S. states and political subdivisions |  | 574,398 |  |  | - |  |  | 35,933 |  |  | (986) |  |  | 609,345
| Corporate securities |  | 7,155,688 |  |  | (18,475) |  |  | 285,509 |  |  | (63,018) |  |  | 7,359,704
| Asset-backed securities |  | 3,141,971 |  |  | (4,915) |  |  | 35,316 |  |  | (2,955) |  |  | 3,169,417
| Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Commercial |  | 1,026,809 |  |  | - |  |  | 55,125 |  |  | (3,535) |  |  | 1,078,399
| Agency residential |  | 2,255,348 |  |  | - |  |  | 47,124 |  |  | (12,205) |  |  | 2,290,267
| Non-agency residential |  | 8,220 |  |  | - |  |  | 6 |  |  | (15) |  |  | 8,211
| Foreign government securities |  | 1,494,989 |  |  | - |  |  | 80,268 |  |  | (21,296) |  |  | 1,553,961
| Foreign corporate securities |  | 3,802,145 |  |  | (1,260) |  |  | 167,015 |  |  | (37,763) |  |  | 3,930,137
Total fixed maturity securities | $ | 20,718,717 |  | $ | (24,650) |  | $ | 735,661 |  | $ | (154,529) |  | $ | 21,275,199
|  | At December 31, 2020
|  | Amortized |  | Allowance for |  | Unrealized |  | Unrealized |  | Market
(Dollars in thousands) | Cost |  | Credit Losses |  | Appreciation |  | Depreciation |  | Value
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government agencies and corporations | $ | 1,325,156 |  | $ | - |  | $ | 49,084 |  | $ | (7,134) |  | $ | 1,367,106
| Obligations of U.S. states and political subdivisions |  | 543,895 |  |  | - |  |  | 34,654 |  |  | (1,254) |  |  | 577,295
| Corporate securities |  | 6,824,800 |  |  | (1,220) |  |  | 380,677 |  |  | (55,231) |  |  | 7,149,026
| Asset-backed securities |  | 2,540,809 |  |  | - |  |  | 30,691 |  |  | (5,698) |  |  | 2,565,802
| Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Commercial |  | 915,923 |  |  | - |  |  | 75,275 |  |  | (895) |  |  | 990,303
| Agency residential |  | 2,206,139 |  |  | - |  |  | 64,663 |  |  | (3,063) |  |  | 2,267,739
| Non-agency residential |  | 5,187 |  |  | - |  |  | 9 |  |  | (2) |  |  | 5,194
| Foreign government securities |  | 1,565,260 |  |  | (22) |  |  | 102,587 |  |  | (22,450) |  |  | 1,645,375
| Foreign corporate securities |  | 3,297,898 |  |  | (503) |  |  | 204,023 |  |  | (29,085) |  |  | 3,472,333
Total fixed maturity securities | $ | 19,225,067 |  | $ | (1,745) |  | $ | 941,663 |  | $ | (124,812) |  | $ | 20,040,173
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity |
| At June 30, 2021 |  | At December 31, 2020
| Amortized |  | Market |  | Amortized |  | Market
(Dollars in thousands) | Cost |  | Value |  | Cost |  | Value
Fixed maturity securities – available for sale: |  |  |  |  |  |  |  |  |  |  |
Due in one year or less | $ | 1,628,113 |  | $ | 1,638,768 |  | $ | 1,365,793 |  | $ | 1,374,674
Due after one year through five years |  | 6,432,847 |  |  | 6,618,429 |  |  | 6,529,189 |  |  | 6,774,785
Due after five years through ten years |  | 4,890,259 |  |  | 5,091,435 |  |  | 4,414,211 |  |  | 4,751,903
Due after ten years |  | 1,335,150 |  |  | 1,380,273 |  |  | 1,247,816 |  |  | 1,309,773
Asset-backed securities |  | 3,141,971 |  |  | 3,169,417 |  |  | 2,540,809 |  |  | 2,565,802
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 1,026,809 |  |  | 1,078,399 |  |  | 915,923 |  |  | 990,303
Agency residential |  | 2,255,348 |  |  | 2,290,267 |  |  | 2,206,139 |  |  | 2,267,739
Non-agency residential |  | 8,220 |  |  | 8,211 |  |  | 5,187 |  |  | 5,194
Total fixed maturity securities | $ | 20,718,717 |  | $ | 21,275,199 |  | $ | 19,225,067 |  | $ | 20,040,173
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Increase (decrease) during the period between the market value and cost |  |  |  |  |  |  |  |  |  |  |
of investments carried at market value, and deferred taxes thereon: |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities | $ | 97,127 |  | $ | 614,077 |  | $ | (235,581) |  | $ | 337,053
Change in unrealized appreciation (depreciation), pre-tax |  | 97,127 |  |  | 614,077 |  |  | (235,581) |  |  | 337,053
Deferred tax benefit (expense) |  | (11,366) |  |  | (69,581) |  |  | 29,061 |  |  | (40,557)
Change in unrealized appreciation (depreciation), |  |  |  |  |  |  |  |  |  |  |
net of deferred taxes, included in shareholders’ equity | $ | 85,761 |  | $ | 544,496 |  | $ | (206,520) |  | $ | 296,496
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type |
|  | Duration of Unrealized Loss at June 30, 2021 By Security Type
| Less than 12 months |  | Greater than 12 months |  | Total
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
|  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized
(Dollars in thousands) | Market Value |  | Depreciation |  | Market Value |  | Depreciation |  | Market Value |  | Depreciation
Fixed maturity securities - available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies and corporations | $ | 341,846 |  | $ | (12,494) |  | $ | 2,620 |  | $ | (262) |  | $ | 344,466 |  | $ | (12,756)
Obligations of U.S. states and political subdivisions |  | 23,662 |  |  | (986) |  |  | - |  |  | - |  |  | 23,662 |  |  | (986)
Corporate securities |  | 1,598,159 |  |  | (61,141) |  |  | 37,936 |  |  | (1,877) |  |  | 1,636,095 |  |  | (63,018)
Asset-backed securities |  | 710,904 |  |  | (2,955) |  |  | - |  |  | - |  |  | 710,904 |  |  | (2,955)
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 134,941 |  |  | (3,535) |  |  | - |  |  | - |  |  | 134,941 |  |  | (3,535)
Agency residential |  | 1,020,232 |  |  | (11,327) |  |  | 43,983 |  |  | (878) |  |  | 1,064,215 |  |  | (12,205)
Non-agency residential |  | 1,309 |  |  | (15) |  |  | - |  |  | - |  |  | 1,309 |  |  | (15)
Foreign government securities |  | 304,722 |  |  | (20,686) |  |  | 3,107 |  |  | (610) |  |  | 307,829 |  |  | (21,296)
Foreign corporate securities |  | 861,693 |  |  | (34,534) |  |  | 30,035 |  |  | (3,229) |  |  | 891,728 |  |  | (37,763)
Total fixed maturity securities | $ | 4,997,468 |  | $ | (147,673) |  | $ | 117,681 |  | $ | (6,856) |  | $ | 5,115,149 |  | $ | (154,529)
|  | Duration of Unrealized Loss at December 31, 2020 By Security Type
| Less than 12 months |  | Greater than 12 months |  | Total
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
|  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized
(Dollars in thousands) | Market Value |  | Depreciation |  | Market Value |  | Depreciation |  | Market Value |  | Depreciation
Fixed maturity securities - available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies and corporations | $ | 135,190 |  | $ | (7,134) |  | $ | - |  | $ | - |  | $ | 135,190 |  | $ | (7,134)
Obligations of U.S. states and political subdivisions |  | 19,524 |  |  | (999) |  |  | 4,059 |  |  | (255) |  |  | 23,583 |  |  | (1,254)
Corporate securities |  | 669,755 |  |  | (26,159) |  |  | 247,962 |  |  | (29,072) |  |  | 917,717 |  |  | (55,231)
Asset-backed securities |  | 235,566 |  |  | (4,768) |  |  | 85,595 |  |  | (930) |  |  | 321,161 |  |  | (5,698)
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 53,511 |  |  | (578) |  |  | 6,592 |  |  | (317) |  |  | 60,103 |  |  | (895)
Agency residential |  | 434,447 |  |  | (2,016) |  |  | 50,353 |  |  | (1,047) |  |  | 484,800 |  |  | (3,063)
Non-agency residential |  | 185 |  |  | (2) |  |  | - |  |  | - |  |  | 185 |  |  | (2)
Foreign government securities |  | 114,755 |  |  | (8,813) |  |  | 150,812 |  |  | (13,637) |  |  | 265,567 |  |  | (22,450)
Foreign corporate securities |  | 354,548 |  |  | (17,489) |  |  | 115,595 |  |  | (11,596) |  |  | 470,143 |  |  | (29,085)
Total fixed maturity securities | $ | 2,017,481 |  | $ | (67,958) |  | $ | 660,968 |  | $ | (56,854) |  | $ | 2,678,449 |  | $ | (124,812)
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Contractual Maturity |
|  | Duration of Unrealized Loss at June 30, 2021 By Maturity
| Less than 12 months |  | Greater than 12 months |  | Total
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
|  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized
(Dollars in thousands) | Market Value |  | Depreciation |  | Market Value |  | Depreciation |  | Market Value |  | Depreciation
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less | $ | 260,687 |  | $ | (15,951) |  | $ | 5,846 |  | $ | (471) |  | $ | 266,533 |  | $ | (16,422)
Due in one year through five years |  | 1,385,520 |  |  | (51,928) |  |  | 48,824 |  |  | (3,048) |  |  | 1,434,344 |  |  | (54,976)
Due in five years through ten years |  | 1,153,553 |  |  | (48,557) |  |  | 19,028 |  |  | (2,459) |  |  | 1,172,581 |  |  | (51,016)
Due after ten years |  | 330,322 |  |  | (13,405) |  |  | - |  |  | - |  |  | 330,322 |  |  | (13,405)
Asset-backed securities |  | 710,904 |  |  | (2,955) |  |  | - |  |  | - |  |  | 710,904 |  |  | (2,955)
Mortgage-backed securities |  | 1,156,482 |  |  | (14,877) |  |  | 43,983 |  |  | (878) |  |  | 1,200,465 |  |  | (15,755)
Total fixed maturity securities | $ | 4,997,468 |  | $ | (147,673) |  | $ | 117,681 |  | $ | (6,856) |  | $ | 5,115,149 |  | $ | (154,529)
|  | Duration of Unrealized Loss at December 31, 2020 By Maturity
| Less than 12 months |  | Greater than 12 months |  | Total
|  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross
|  |  |  | Unrealized |  |  |  |  | Unrealized |  |  |  |  | Unrealized
(Dollars in thousands) | Market Value |  | Depreciation |  | Market Value |  | Depreciation |  | Market Value |  | Depreciation
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due in one year or less | $ | 96,144 |  | $ | (4,942) |  | $ | 112,419 |  | $ | (12,071) |  | $ | 208,563 |  | $ | (17,013)
Due in one year through five years |  | 653,816 |  |  | (32,469) |  |  | 283,866 |  |  | (21,319) |  |  | 937,682 |  |  | (53,788)
Due in five years through ten years |  | 422,517 |  |  | (19,392) |  |  | 49,749 |  |  | (2,034) |  |  | 472,266 |  |  | (21,426)
Due after ten years |  | 121,295 |  |  | (3,791) |  |  | 72,394 |  |  | (19,136) |  |  | 193,689 |  |  | (22,927)
Asset-backed securities |  | 235,566 |  |  | (4,768) |  |  | 85,595 |  |  | (930) |  |  | 321,161 |  |  | (5,698)
Mortgage-backed securities |  | 488,143 |  |  | (2,596) |  |  | 56,945 |  |  | (1,364) |  |  | 545,088 |  |  | (3,960)
Total fixed maturity securities | $ | 2,017,481 |  | $ | (67,958) |  | $ | 660,968 |  | $ | (56,854) |  | $ | 2,678,449 |  | $ | (124,812)
Summary Of Components Of Net Investment Income |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Fixed maturities | $ | 148,262 |  | $ | 133,918 |  | $ | 289,178 |  | $ | 271,842
Equity securities |  | 3,493 |  |  | 3,662 |  |  | 8,331 |  |  | 7,183
Short-term investments and cash |  | 773 |  |  | 1,687 |  |  | 953 |  |  | 3,862
Other invested assets: |  |  |  |  |  |  |  |  |  |  |
Limited partnerships |  | 239,966 |  |  | (88,254) |  |  | 354,299 |  |  | (66,686)
Other |  | 25,855 |  |  | (2,962) |  |  | 31,874 |  |  | (16,033)
Gross investment income before adjustments |  | 418,349 |  |  | 48,051 |  |  | 684,635 |  |  | 200,168
Funds held interest income (expense) |  | 3,287 |  |  | 2,021 |  |  | 11,253 |  |  | 10,237
Future policy benefit reserve income (expense) |  | (170) |  |  | (303) |  |  | (461) |  |  | (514)
Gross investment income |  | 421,466 |  |  | 49,769 |  |  | 695,427 |  |  | 209,891
Investment expenses |  | (14,371) |  |  | (11,686) |  |  | (27,919) |  |  | (24,008)
Net investment income | $ | 407,095 |  | $ | 38,083 |  | $ | 667,508 |  | $ | 185,883
Summary Of Components Of Net Realized Capital Gains (Losses) |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2021 |  |  | 2020 |  | 2021 |  |  | 2020
Fixed maturity securities, market value: |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | $ | (15,927) |  | $ | (4,063) |  | $ | (22,904) |  | $ | (25,837)
Gains (losses) from sales |  | 10,060 |  |  | 9,619 |  |  | 19,234 |  |  | (4,457)
Fixed maturity securities, fair value: |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  | - |  |  | - |  |  | - |  |  | -
Gains (losses) from fair value adjustments |  | - |  |  | (272) |  |  | - |  |  | (1,395)
Equity securities, fair value: |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  | 3,755 |  |  | 16,274 |  |  | 9,993 |  |  | (11,325)
Gains (losses) from fair value adjustments |  | 103,525 |  |  | 161,694 |  |  | 132,581 |  |  | 17,691
Other invested assets |  | 2,748 |  |  | 1,293 |  |  | 4,094 |  |  | (1,034)
Short-term investments gain (loss) |  | (52) |  |  | 103 |  |  | 13 |  |  | 417
Total net realized capital gains (losses) | $ | 104,109 |  | $ | 184,648 |  | $ | 143,011 |  | $ | (25,940)
| Roll Forward of Allowance for Credit Losses
| Three Months Ended June 30, 2021 |  | Six Months Ended June 30, 2021
|  |  |  |  |  |  | Foreign |  | Foreign |  |  |  |  |  |  |  |  |  |  | Foreign |  | Foreign |  |  |
| Corporate |  | Asset-Backed |  | Government |  | Corporate |  |  |  |  | Corporate |  | Asset-Backed |  | Government |  | Corporate |  |  |
| Securities |  | Securities |  | Securities |  | Securities |  | Total |  | Securities |  | Securities |  | Securities |  | Securities |  | Total
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance | $ | (3,603) |  | $ | (4,915) |  | $ | - |  | $ | (205) |  | $ | (8,723) |  | $ | (1,220) |  | $ | - |  | $ | (22) |  | $ | (503) |  | $ | (1,745)
Credit losses on securities where credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
losses were not previously recorded |  | (13,537) |  |  | - |  |  | - |  |  | (1,055) |  |  | (14,592) |  |  | (15,920) |  |  | (4,915) |  |  | - |  |  | (1,055) |  |  | (21,890)
Increases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  | (1,468) |  |  | - |  |  | - |  |  | - |  |  | (1,468) |  |  | (1,468) |  |  | - |  |  | - |  |  | - |  |  | (1,468)
Decreases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | -
Reduction in allowance due to disposals |  | 133 |  |  | - |  |  | - |  |  | - |  |  | 133 |  |  | 133 |  |  | - |  |  | 22 |  |  | 298 |  |  | 453
Balance as of June 30, 2021 | $ | (18,475) |  | $ | (4,915) |  | $ | - |  | $ | (1,260) |  | $ | (24,650) |  | $ | (18,475) |  | $ | (4,915) |  | $ | - |  | $ | (1,260) |  | $ | (24,650)
| Roll Forward of Allowance for Credit Losses
| Three Months Ended June 30, 2020 |  | Six Months Ended June 30, 2020
|  |  |  | Foreign |  | Foreign |  |  |  |  |  |  |  | Foreign |  | Foreign |  |  |
| Corporate |  | Government |  | Corporate |  |  |  |  | Corporate |  | Government |  | Corporate |  |  |
| Securities |  | Securities |  | Securities |  | Total |  | Securities |  | Securities |  | Securities |  | Total
Beginning Balance | $ | (17,305) |  | $ | (519) |  | $ | (3,950) |  | $ | (21,774) |  | $ | - |  | $ | - |  | $ | - |  | $ | -
Credit losses on securities where credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
losses were not previously recorded |  | (10,355) |  |  | - |  |  | (605) |  |  | (10,960) |  |  | (27,660) |  |  | (519) |  |  | (4,555) |  |  | (32,734)
Increases in allowance on previously |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  | (782) |  |  | - |  |  | (300) |  |  | (1,082) |  |  | (782) |  |  | - |  |  | (300) |  |  | (1,082)
Decreases in allowance on previously |  |  |  |  |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  | 3,431 |  |  | 212 |  |  | 693 |  |  | 4,336 |  |  | 3,431 |  |  | 212 |  |  | 693 |  |  | 4,336
Reduction in allowance due to disposals |  | 2,758 |  |  | 215 |  |  | 670 |  |  | 3,643 |  |  | 2,758 |  |  | 215 |  |  | 670 |  |  | 3,643
Balance as of June 30, 2020 | $ | (22,253) |  | $ | (92) |  | $ | (3,492) |  | $ | (25,837) |  | $ | (22,253) |  | $ | (92) |  | $ | (3,492) |  | $ | (25,837)
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Proceeds from sales of fixed maturity securities | $ | 371,459 |  | $ | 488,320 |  | $ | 599,737 |  | $ | 990,273
Gross gains from sales |  | 19,870 |  |  | 21,355 |  |  | 34,734 |  |  | 35,356
Gross losses from sales |  | (9,810) |  |  | (11,736) |  |  | (15,500) |  |  | (39,813)
Proceeds from sales of equity securities | $ | 193,350 |  | $ | 100,344 |  | $ | 474,663 |  | $ | 213,185
Gross gains from sales |  | 5,803 |  |  | 18,172 |  |  | 18,107 |  |  | 20,756
Gross losses from sales |  | (2,048) |  |  | (1,898) |  |  | (8,114) |  |  | (32,081)

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