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Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments [Abstract] |
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments |
|  | At December 31, 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 | $ | 1,407,256 |  | $ | - |  | $ | 23,720 |  | $ | (10,358) |  | $ | 1,420,618
| Obligations of U.S. states and political subdivisions |  | 558,842 |  |  | (151) |  |  | 29,080 |  |  | (1,150) |  |  | 586,621
| Corporate securities |  | 7,443,535 |  |  | (19,267) |  |  | 195,210 |  |  | (62,580) |  |  | 7,556,898
| Asset-backed securities |  | 3,579,439 |  |  | (7,679) |  |  | 21,817 |  |  | (11,848) |  |  | 3,581,729
| Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Commercial |  | 1,032,506 |  |  | - |  |  | 37,550 |  |  | (5,690) |  |  | 1,064,366
| Agency residential |  | 2,361,208 |  |  | - |  |  | 32,997 |  |  | (18,873) |  |  | 2,375,332
| Non-agency residential |  | 6,530 |  |  | - |  |  | 22 |  |  | (16) |  |  | 6,536
| Foreign government securities |  | 1,423,634 |  |  | - |  |  | 41,957 |  |  | (28,079) |  |  | 1,437,512
| Foreign corporate securities |  | 4,250,642 |  |  | (2,641) |  |  | 95,195 |  |  | (64,536) |  |  | 4,278,660
Total fixed maturity securities | $ | 22,063,592 |  | $ | (29,738) |  | $ | 477,548 |  | $ | (203,130) |  | $ | 22,308,272
|  | 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 December 31, 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 | $ | 1,398,742 |  | $ | 1,398,006 |  | $ | 1,365,793 |  | $ | 1,374,674
Due after one year through five years |  | 7,075,077 |  |  | 7,154,468 |  |  | 6,529,189 |  |  | 6,774,785
Due after five years through ten years |  | 5,003,792 |  |  | 5,100,672 |  |  | 4,414,211 |  |  | 4,751,903
Due after ten years |  | 1,606,298 |  |  | 1,627,163 |  |  | 1,247,816 |  |  | 1,309,773
Asset-backed securities |  | 3,579,439 |  |  | 3,581,729 |  |  | 2,540,809 |  |  | 2,565,802
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 1,032,506 |  |  | 1,064,366 |  |  | 915,923 |  |  | 990,303
Agency residential |  | 2,361,208 |  |  | 2,375,332 |  |  | 2,206,139 |  |  | 2,267,739
Non-agency residential |  | 6,530 |  |  | 6,536 |  |  | 5,187 |  |  | 5,194
Total fixed maturity securities | $ | 22,063,592 |  | $ | 22,308,272 |  | $ | 19,225,067 |  | $ | 20,040,173
Summary Of Changes In Net Unrealized Appreciation (Depreciation) For The Company's Investments |
| Years Ended December 31,
(Dollars in thousands) | 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 and short-term investments | $ | (542,343) |  | $ | 465,192
Change in unrealized appreciation (depreciation), pre-tax |  | (542,343) |  |  | 465,192
Deferred tax benefit (expense) |  | 57,581 |  |  | (45,458)
Change in unrealized appreciation (depreciation), |  |  |  |  |
net of deferred taxes, included in shareholders’ equity | $ | (484,762) |  | $ | 419,734
Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities, By Security Type |
|  | Duration of Unrealized Loss at December 31, 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 | $ | 504,168 |  | $ | (6,264) |  | $ | 91,735 |  | $ | (4,094) |  | $ | 595,903 |  | $ | (10,358)
Obligations of U.S. states and political subdivisions |  | 51,094 |  |  | (1,038) |  |  | 2,558 |  |  | (112) |  |  | 53,652 |  |  | (1,150)
Corporate securities |  | 2,132,576 |  |  | (38,316) |  |  | 472,831 |  |  | (24,264) |  |  | 2,605,407 |  |  | (62,580)
Asset-backed securities |  | 1,954,079 |  |  | (11,180) |  |  | 41,823 |  |  | (668) |  |  | 1,995,902 |  |  | (11,848)
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 221,852 |  |  | (2,854) |  |  | 40,496 |  |  | (2,836) |  |  | 262,348 |  |  | (5,690)
Agency residential |  | 1,101,215 |  |  | (12,178) |  |  | 279,697 |  |  | (6,695) |  |  | 1,380,912 |  |  | (18,873)
Non-agency residential |  | 2,320 |  |  | (14) |  |  | 156 |  |  | (2) |  |  | 2,476 |  |  | (16)
Foreign government securities |  | 392,447 |  |  | (9,709) |  |  | 100,673 |  |  | (18,370) |  |  | 493,120 |  |  | (28,079)
Foreign corporate securities |  | 1,734,510 |  |  | (46,247) |  |  | 210,722 |  |  | (18,289) |  |  | 1,945,232 |  |  | (64,536)
Total fixed maturity securities | $ | 8,094,261 |  | $ | (127,800) |  | $ | 1,240,691 |  | $ | (75,330) |  | $ | 9,334,952 |  | $ | (203,130)
|  | 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 December 31, 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 | $ | 129,860 |  | $ | (2,415) |  | $ | 136,827 |  | $ | (11,832) |  | $ | 266,687 |  | $ | (14,247)
Due in one year through five years |  | 2,165,467 |  |  | (35,264) |  |  | 446,247 |  |  | (28,685) |  |  | 2,611,714 |  |  | (63,949)
Due in five years through ten years |  | 1,727,823 |  |  | (47,413) |  |  | 244,454 |  |  | (22,038) |  |  | 1,972,277 |  |  | (69,451)
Due after ten years |  | 791,645 |  |  | (16,482) |  |  | 50,991 |  |  | (2,574) |  |  | 842,636 |  |  | (19,056)
Asset-backed securities |  | 1,954,079 |  |  | (11,180) |  |  | 41,823 |  |  | (668) |  |  | 1,995,902 |  |  | (11,848)
Mortgage-backed securities |  | 1,325,387 |  |  | (15,046) |  |  | 320,349 |  |  | (9,533) |  |  | 1,645,736 |  |  | (24,579)
Total fixed maturity securities | $ | 8,094,261 |  | $ | (127,800) |  | $ | 1,240,691 |  | $ | (75,330) |  | $ | 9,334,952 |  | $ | (203,130)
|  | 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 |
| Years Ended December 31,
(Dollars in thousands) | 2021 |  | 2020 |  |  | 2019
Fixed maturities | $ | 561,091 |  | $ | 542,363 |  | $ | 520,291
Equity securities |  | 17,276 |  |  | 18,776 |  |  | 19,505
Short-term investments and cash |  | 1,329 |  |  | 5,012 |  |  | 17,619
Other invested assets |  |  |  |  |  |  |  |
Limited partnerships |  | 565,265 |  |  | 112,853 |  |  | 105,815
Other |  | 62,944 |  |  | 1,699 |  |  | 14,117
Gross investment income before adjustments |  | 1,207,905 |  |  | 680,703 |  |  | 677,347
Funds held interest income (expense) |  | 12,324 |  |  | 12,754 |  |  | 13,271
Future policy benefit reserve income (expense) |  | (1,093) |  |  | (1,237) |  |  | (1,380)
Gross investment income |  | 1,219,136 |  |  | 692,220 |  |  | 689,238
Investment expenses |  | (54,244) |  |  | (49,755) |  |  | (42,099)
Net investment income | $ | 1,164,892 |  | $ | 642,465 |  | $ | 647,139
Summary Of Components Of Net Realized Capital Gains (Losses) |
| Years Ended December 31,
(Dollars in thousands) | 2021 |  |  | 2020 |  | 2019
Fixed maturity securities, market value: |  |  |  |  |  |  |  |
Allowance for credit losses | $ | (27,992) |  | $ | (1,745) |  | $ | -
Other-than-temporary impairments |  | - |  |  | - |  |  | (20,899)
Gains (losses) from sales |  | 16,503 |  |  | (2,214) |  |  | 28,025
Fixed maturity securities, fair value: |  |  |  |  |  |  |  |
Gains (losses) from sales |  | - |  |  | (2,863) |  |  | 355
Gains (losses) from fair value adjustments |  | - |  |  | 1,944 |  |  | 1,808
Equity securities, fair value: |  |  |  |  |  |  |  |
Gains (losses) from sales |  | 27,596 |  |  | (8,963) |  |  | 4,148
Gains (losses) from fair value adjustments |  | 235,686 |  |  | 278,461 |  |  | 165,200
Other invested assets |  | 6,142 |  |  | 1,705 |  |  | 6,003
Short-term investments gain (loss) |  | 8 |  |  | 1,324 |  |  | 364
Total net realized capital gains (losses) | $ | 257,943 |  | $ | 267,649 |  | $ | 185,004
|  | Roll Forward of Allowance for Credit Losses
|  | Twelve Months Ended December 31, 2021
|  |  |  |  |  |  | Obligations of |  |  |  |  |  |  |
|  |  |  |  |  |  |  | U.S. States |  | Foreign |  | Foreign |  |  |
|  | Corporate |  | Asset-Backed |  | and Political |  | Government |  | Corporate |  |  |
|  | Securities |  | Securities |  | Subdivisions |  | Securities |  | Securities |  | Total
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | (1,220) |  | $ | - |  | $ | - |  | $ | (22) |  | $ | (503) |  | $ | (1,745)
Credit losses on securities where credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
losses were not previously recorded |  |  | (21,177) |  |  | (4,915) |  |  | (151) |  |  | - |  |  | (2,436) |  |  | (28,679)
Increases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  |  | (2,529) |  |  | (2,764) |  |  |  |  |  | - |  |  | - |  |  | (5,293)
Decreases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  |  | - |  |  | - |  |  |  |  |  | - |  |  | - |  |  | -
Reduction in allowance due to disposals |  |  | 5,659 |  |  | - |  |  |  |  |  | 22 |  |  | 298 |  |  | 5,979
Balance as of December 31 |  | $ | (19,267) |  | $ | (7,679) |  | $ | (151) |  | $ | - |  | $ | (2,641) |  | $ | (29,738)
|  | Roll Forward of Allowance for Credit Losses
|  | Twelve Months Ended December 31, 2020
|  |  |  |  |  | Obligations of |  |  |  |  |  |
|  |  |  |  |  | U.S. States |  | Foreign |  | Foreign |  |
|  | Corporate |  | Asset-Backed |  | and Political |  | Government |  | Corporate |  |
|  | Securities |  | Securities |  | Subdivisions |  | Securities |  | Securities |  | Total
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | -
Credit losses on securities where credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
losses were not previously recorded |  |  | (27,666) |  |  | - |  |  | - |  |  | (518) |  |  | (4,700) |  |  | (32,884)
Increases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  |  | (6,136) |  |  | - |  |  | - |  |  | (28) |  |  | (481) |  |  | (6,645)
Decreases in allowance on previously |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
impaired securities |  |  | 4,333 |  |  | - |  |  | - |  |  | 309 |  |  | 883 |  |  | 5,525
Reduction in allowance due to disposals |  |  | 28,249 |  |  | - |  |  | - |  |  | 215 |  |  | 3,795 |  |  | 32,259
Balance as of December 31 |  | $ | (1,220) |  | $ | - |  | $ | - |  | $ | (22) |  | $ | (503) |  | $ | (1,745)
Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities |
| Years Ended December 31,
(Dollars in thousands) | 2021 |  | 2020 |  | 2019
Proceeds from sales of fixed maturity securities | $ | 1,915,916 |  | $ | 1,950,774 |  | $ | 3,283,154
Gross gains from sales |  | 71,744 |  |  | 79,609 |  |  | 63,721
Gross losses from sales |  | (55,241) |  |  | (84,686) |  |  | (35,341)
Proceeds from sales of equity securities | $ | 990,376 |  | $ | 376,347 |  | $ | 283,965
Gross gains from sales |  | 42,241 |  |  | 37,415 |  |  | 14,274
Gross losses from sales |  | (14,645) |  |  | (46,378) |  |  | (10,126)

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- Definition Summary Of Aggregate Market Value And Gross Unrealized Depreciation Of Fixed Maturity And Equity Securities By Contractual Maturity [Table Text Block] + References No definition available. + Details
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- Definition Unrealized Appreciation Depreciation Of Investments [Table Text Block] + References No definition available. + Details
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