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Investments (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments [Abstract] |
Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments |
|  | At June 30, 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 | $ | 1,355,970 |  | $ | - |  | $ | 79,243 |  | $ | (282) |  | $ | 1,434,931
| Obligations of U.S. states and political subdivisions |  | 508,478 |  |  | - |  |  | 27,597 |  |  | (3,794) |  |  | 532,281
| Corporate securities |  | 6,349,631 |  |  | (22,253) |  |  | 356,702 |  |  | (66,292) |  |  | 6,617,788
| Asset-backed securities |  | 1,076,648 |  |  | - |  |  | 16,728 |  |  | (23,818) |  |  | 1,069,558
| Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Commercial |  | 850,616 |  |  | - |  |  | 71,017 |  |  | (1,837) |  |  | 919,796
| Agency residential |  | 2,016,481 |  |  | - |  |  | 74,813 |  |  | (2,043) |  |  | 2,089,251
| Non-agency residential |  | 3,153 |  |  | - |  |  | - |  |  | (42) |  |  | 3,111
| Foreign government securities |  | 1,461,380 |  |  | (92) |  |  | 73,849 |  |  | (33,937) |  |  | 1,501,200
| Foreign corporate securities |  | 2,769,881 |  |  | (3,492) |  |  | 158,296 |  |  | (37,342) |  |  | 2,887,343
Total fixed maturity securities | $ | 16,392,238 |  |  | (25,837) |  | $ | 858,245 |  | $ | (169,387) |  | $ | 17,055,259
|  | At December 31, 2019
|  | Amortized |  | Unrealized |  | Unrealized |  | Market |  | OTTI in AOCI
(Dollars in thousands) | Cost |  | Appreciation |  | Depreciation |  | Value |  | (a)
Fixed maturity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. Treasury securities and obligations of |  |  |  |  |  |  |  |  |  |  |  |  |  |
| U.S. government agencies and corporations | $ | 1,489,660 |  | $ | 28,357 |  | $ | (2,214) |  | $ | 1,515,803 |  | $ | -
| Obligations of U.S. states and political subdivisions |  | 507,353 |  |  | 29,651 |  |  | (89) |  |  | 536,915 |  |  | -
| Corporate securities |  | 6,227,661 |  |  | 185,052 |  |  | (37,767) |  |  | 6,374,946 |  |  | 469
| Asset-backed securities |  | 892,373 |  |  | 6,818 |  |  | (1,858) |  |  | 897,333 |  |  | -
| Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Commercial |  | 814,570 |  |  | 31,236 |  |  | (1,249) |  |  | 844,557 |  |  | -
| Agency residential |  | 2,173,099 |  |  | 36,361 |  |  | (10,879) |  |  | 2,198,581 |  |  | -
| Non-agency residential |  | 5,723 |  |  | - |  |  | (20) |  |  | 5,703 |  |  | -
| Foreign government securities |  | 1,492,315 |  |  | 47,148 |  |  | (33,513) |  |  | 1,505,950 |  |  | 71
| Foreign corporate securities |  | 2,870,737 |  |  | 107,999 |  |  | (33,580) |  |  | 2,945,156 |  |  | 447
Total fixed maturity securities | $ | 16,473,491 |  | $ | 472,622 |  | $ | (121,169) |  | $ | 16,824,944 |  | $ | 987
(a) Represents the amount of OTTI recognized in AOCI. Amount includes unrealized gains and losses on impaired securities relating to changes in the value of such securities subsequent to the impairment measurement date.
Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity |
| At June 30, 2020 |  | At December 31, 2019
| Amortized |  | Market |  | Amortized |  | Market
(Dollars in thousands) | Cost |  | Value |  | Cost |  | Value
Fixed maturity securities – available for sale: |  |  |  |  |  |  |  |  |  |  |
Due in one year or less | $ | 1,401,446 |  | $ | 1,413,299 |  | $ | 1,456,960 |  | $ | 1,457,919
Due after one year through five years |  | 6,415,691 |  |  | 6,636,170 |  |  | 6,757,107 |  |  | 6,869,359
Due after five years through ten years |  | 3,712,330 |  |  | 3,987,207 |  |  | 3,471,370 |  |  | 3,609,816
Due after ten years |  | 915,873 |  |  | 936,867 |  |  | 902,289 |  |  | 941,676
Asset-backed securities |  | 1,076,648 |  |  | 1,069,558 |  |  | 892,373 |  |  | 897,333
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 850,616 |  |  | 919,796 |  |  | 814,570 |  |  | 844,557
Agency residential |  | 2,016,481 |  |  | 2,089,251 |  |  | 2,173,099 |  |  | 2,198,581
Non-agency residential |  | 3,153 |  |  | 3,111 |  |  | 5,723 |  |  | 5,703
Total fixed maturity securities | $ | 16,392,238 |  | $ | 17,055,259 |  | $ | 16,473,491 |  | $ | 16,824,944
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) | 2020 |  | 2019 |  | 2020 |  | 2019
Increase (decrease) during the period between the market value and cost |  |  |  |  |  |  |  |  |  |  |
of investments carried at market value, and deferred taxes thereon: |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities | $ | 614,077 |  | $ | 227,266 |  | $ | 337,053 |  | $ | 481,160
Fixed maturity securities, other-than-temporary impairment |  | - |  |  | (1,499) |  |  | - |  |  | (1,743)
Change in unrealized appreciation (depreciation), pre-tax |  | 614,077 |  |  | 225,767 |  |  | 337,053 |  |  | 479,417
Deferred tax benefit (expense) |  | (69,581) |  |  | (29,954) |  |  | (40,557) |  |  | (52,431)
Deferred tax benefit (expense), other-than-temporary impairment |  | - |  |  | 77 |  |  | - |  |  | 147
Change in unrealized appreciation (depreciation), |  |  |  |  |  |  |  |  |  |  |
net of deferred taxes, included in shareholders’ equity | $ | 544,496 |  | $ | 195,890 |  | $ | 296,496 |  | $ | 427,133
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, 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 | $ | 28,192 |  | $ | (282) |  | $ | - |  | $ | - |  | $ | 28,192 |  | $ | (282)
Obligations of U.S. states and political subdivisions |  | 71,054 |  |  | (3,569) |  |  | 3,331 |  |  | (225) |  |  | 74,385 |  |  | (3,794)
Corporate securities |  | 712,066 |  |  | (28,954) |  |  | 170,908 |  |  | (37,338) |  |  | 882,974 |  |  | (66,292)
Asset-backed securities |  | 457,430 |  |  | (16,504) |  |  | 138,272 |  |  | (7,314) |  |  | 595,702 |  |  | (23,818)
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 47,046 |  |  | (1,196) |  |  | 6,017 |  |  | (641) |  |  | 53,063 |  |  | (1,837)
Agency residential |  | 137,030 |  |  | (1,067) |  |  | 90,425 |  |  | (976) |  |  | 227,455 |  |  | (2,043)
Non-agency residential |  | 213 |  |  | (3) |  |  | 2,898 |  |  | (39) |  |  | 3,111 |  |  | (42)
Foreign government securities |  | 112,183 |  |  | (6,363) |  |  | 201,603 |  |  | (27,574) |  |  | 313,786 |  |  | (33,937)
Foreign corporate securities |  | 401,754 |  |  | (10,593) |  |  | 217,672 |  |  | (26,749) |  |  | 619,426 |  |  | (37,342)
Total fixed maturity securities | $ | 1,966,968 |  | $ | (68,531) |  | $ | 831,126 |  | $ | (100,856) |  | $ | 2,798,094 |  | $ | (169,387)
|  | Duration of Unrealized Loss at December 31, 2019 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 | $ | 85,527 |  | $ | (1,005) |  | $ | 249,371 |  | $ | (1,209) |  | $ | 334,898 |  | $ | (2,214)
Obligations of U.S. states and political subdivisions |  | 4,600 |  |  | (38) |  |  | 5,522 |  |  | (51) |  |  | 10,122 |  |  | (89)
Corporate securities |  | 547,120 |  |  | (9,877) |  |  | 395,369 |  |  | (27,890) |  |  | 942,489 |  |  | (37,767)
Asset-backed securities |  | 176,222 |  |  | (1,027) |  |  | 94,190 |  |  | (831) |  |  | 270,412 |  |  | (1,858)
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial |  | 83,127 |  |  | (689) |  |  | 23,063 |  |  | (560) |  |  | 106,190 |  |  | (1,249)
Agency residential |  | 344,267 |  |  | (1,834) |  |  | 488,680 |  |  | (9,045) |  |  | 832,947 |  |  | (10,879)
Non-agency residential |  | 332 |  |  | - |  |  | 3,976 |  |  | (20) |  |  | 4,308 |  |  | (20)
Foreign government securities |  | 210,766 |  |  | (4,770) |  |  | 283,648 |  |  | (28,743) |  |  | 494,414 |  |  | (33,513)
Foreign corporate securities |  | 278,403 |  |  | (7,553) |  |  | 365,808 |  |  | (26,027) |  |  | 644,211 |  |  | (33,580)
Total fixed maturity securities | $ | 1,730,364 |  | $ | (26,793) |  | $ | 1,909,627 |  | $ | (94,376) |  | $ | 3,639,991 |  | $ | (121,169)
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, 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 | $ | 74,911 |  | $ | (897) |  | $ | 154,772 |  | $ | (24,782) |  | $ | 229,683 |  | $ | (25,679)
Due in one year through five years |  | 738,690 |  |  | (23,176) |  |  | 325,533 |  |  | (32,475) |  |  | 1,064,223 |  |  | (55,651)
Due in five years through ten years |  | 368,721 |  |  | (16,989) |  |  | 51,998 |  |  | (8,556) |  |  | 420,719 |  |  | (25,545)
Due after ten years |  | 142,927 |  |  | (8,699) |  |  | 61,211 |  |  | (26,073) |  |  | 204,138 |  |  | (34,772)
Asset-backed securities |  | 457,430 |  |  | (16,504) |  |  | 138,272 |  |  | (7,314) |  |  | 595,702 |  |  | (23,818)
Mortgage-backed securities |  | 184,289 |  |  | (2,266) |  |  | 99,340 |  |  | (1,656) |  |  | 283,629 |  |  | (3,922)
Total fixed maturity securities | $ | 1,966,968 |  | $ | (68,531) |  | $ | 831,126 |  | $ | (100,856) |  | $ | 2,798,094 |  | $ | (169,387)
|  | Duration of Unrealized Loss at December 31, 2019 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 | $ | 67,879 |  | $ | (1,237) |  | $ | 416,583 |  | $ | (23,004) |  | $ | 484,462 |  | $ | (24,241)
Due in one year through five years |  | 464,753 |  |  | (7,960) |  |  | 689,195 |  |  | (38,138) |  |  | 1,153,948 |  |  | (46,098)
Due in five years through ten years |  | 495,741 |  |  | (12,388) |  |  | 103,612 |  |  | (11,100) |  |  | 599,353 |  |  | (23,488)
Due after ten years |  | 98,043 |  |  | (1,658) |  |  | 90,328 |  |  | (11,678) |  |  | 188,371 |  |  | (13,336)
Asset-backed securities |  | 176,222 |  |  | (1,027) |  |  | 94,190 |  |  | (831) |  |  | 270,412 |  |  | (1,858)
Mortgage-backed securities |  | 427,726 |  |  | (2,523) |  |  | 515,719 |  |  | (9,625) |  |  | 943,445 |  |  | (12,148)
Total fixed maturity securities | $ | 1,730,364 |  | $ | (26,793) |  | $ | 1,909,627 |  | $ | (94,376) |  | $ | 3,639,991 |  | $ | (121,169)
Summary Of Components Of Net Investment Income |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2020 |  | 2019 |  | 2020 |  | 2019
Fixed maturities | $ | 133,918 |  | $ | 126,593 |  | $ | 271,842 |  | $ | 253,301
Equity securities |  | 3,662 |  |  | 4,596 |  |  | 7,183 |  |  | 8,103
Short-term investments and cash |  | 1,687 |  |  | 5,393 |  |  | 3,862 |  |  | 9,598
Other invested assets |  |  |  |  |  |  |  |  |  |  |
Limited partnerships |  | (88,254) |  |  | 48,243 |  |  | (66,686) |  |  | 56,540
Other |  | (2,962) |  |  | 3,299 |  |  | (16,033) |  |  | 6,279
Gross investment income before adjustments |  | 48,051 |  |  | 188,124 |  |  | 200,168 |  |  | 333,821
Funds held interest income (expense) |  | 2,021 |  |  | 1,422 |  |  | 10,237 |  |  | 7,390
Future policy benefit reserve income (expense) |  | (303) |  |  | (359) |  |  | (514) |  |  | (593)
Gross investment income |  | 49,769 |  |  | 189,187 |  |  | 209,891 |  |  | 340,618
Investment expenses |  | (11,686) |  |  | (10,159) |  |  | (24,008) |  |  | (20,614)
Net investment income | $ | 38,083 |  | $ | 179,028 |  | $ | 185,883 |  | $ | 320,004
Summary Of Components Of Net Realized Capital Gains (Losses) |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2020 |  |  | 2019 |  | 2020 |  |  | 2019
Fixed maturity securities, market value: |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses | $ | (4,063) |  | $ | - |  | $ | (25,837) |  | $ | -
Other-than-temporary impairments |  | - |  |  | (5,157) |  |  | - |  |  | (8,090)
Gains (losses) from sales |  | 9,619 |  |  | 6,097 |  |  | (4,457) |  |  | 11,370
Fixed maturity securities, fair value: |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  | - |  |  | 356 |  |  | - |  |  | 356
Gains (losses) from fair value adjustments |  | (272) |  |  | - |  |  | (1,395) |  |  | 13
Equity securities, fair value: |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from sales |  | 16,274 |  |  | (1,315) |  |  | (11,325) |  |  | 3,733
Gains (losses) from fair value adjustments |  | 161,694 |  |  | 30,362 |  |  | 17,691 |  |  | 114,803
Other invested assets |  | 1,293 |  |  | (153) |  |  | (1,034) |  |  | 243
Short-term investments gain (loss) |  | 103 |  |  | 82 |  |  | 417 |  |  | 76
Total net realized capital gains (losses) | $ | 184,648 |  | $ | 30,272 |  | $ | (25,940) |  | $ | 122,504
| Roll Forward of Alowance for Credit Losses
| Three Months Eded 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
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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) | 2020 |  | 2019 |  | 2020 |  | 2019
Proceeds from sales of fixed maturity securities | $ | 488,320 |  | $ | 522,687 |  | $ | 990,273 |  | $ | 2,320,913
Gross gains from sales |  | 21,355 |  |  | 11,908 |  |  | 35,356 |  |  | 28,046
Gross losses from sales |  | (11,736) |  |  | (5,455) |  |  | (39,813) |  |  | (16,320)
Proceeds from sales of equity securities | $ | 100,344 |  | $ | 79,733 |  | $ | 213,185 |  | $ | 149,233
Gross gains from sales |  | 18,172 |  |  | 2,576 |  |  | 20,756 |  |  | 8,251
Gross losses from sales |  | (1,898) |  |  | (3,891) |  |  | (32,081) |  |  | (4,518)

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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 Summary of aggregate market value and gross unrealized depreciation of fixed maturity and equity securities by security type [Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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