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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2021
Other Comprehensive Income (Loss) [Abstract] |
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations |
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
(Dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related | $ | (547,690) |  | $ | 59,312 |  | $ | (488,378) |  | $ | 462,939 |  | $ | (39,729) |  | $ | 423,210 |  | $ | 547,539 |  | $ | (49,665) |  | $ | 497,874
URA(D) on securities - OTTI |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (1,559) |  |  | 115 |  |  | (1,444)
Reclassification of net realized losses (gains) included in net income (loss) |  | 5,347 |  |  | (1,731) |  |  | 3,616 |  |  | 2,253 |  |  | (5,729) |  |  | (3,476) |  |  | (13,129) |  |  | 516 |  |  | (12,613)
Foreign currency translation adjustments |  | (64,421) |  |  | 2,330 |  |  | (62,091) |  |  | 90,142 |  |  | (3,815) |  |  | 86,327 |  |  | 18,585 |  |  | (4,555) |  |  | 14,030
Benefit plan actuarial net gain (loss) |  | 7,912 |  |  | (1,661) |  |  | 6,251 |  |  | (7,107) |  |  | 1,492 |  |  | (5,615) |  |  | (15,938) |  |  | 3,347 |  |  | (12,591)
Reclassification of benefit plan liability amortization included in net income (loss) |  | 21,807 |  |  | (4,580) |  |  | 17,227 |  |  | 7,974 |  |  | (1,674) |  |  | 6,300 |  |  | 6,902 |  |  | (1,449) |  |  | 5,453
Total other comprehensive income (loss) | $ | (577,045) |  | $ | 53,670 |  | $ | (523,375) |  | $ | 556,201 |  | $ | (49,455) |  | $ | 506,746 |  | $ | 542,400 |  | $ | (51,691) |  | $ | 490,709
Reclassification From Accumulated Other Comprehensive Income |
|  | Years Ended |  |
|  | December 31, |  | Affected line item within the statements of
AOCI component |  | 2021 |  | 2020 |  | operations and comprehensive income (loss)
(Dollars in thousands) |  |  |  |  |  |  |  |
URA(D) on securities |  | $ | 5,347 |  | $ | 2,253 |  | Other net realized capital gains (losses)
|  |  | (1,731) |  |  | (5,729) |  | Income tax expense (benefit)
|  | $ | 3,616 |  | $ | (3,476) |  | Net income (loss)
Benefit plan net gain (loss) |  | $ | 21,807 |  | $ | 7,974 |  | Other underwriting expenses
|  |  | (4,580) |  |  | (1,674) |  | Income tax expense (benefit)
|  | $ | 17,227 |  | $ | 6,300 |  | Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets |
| Years Ended
| December 31,
(Dollars in thousands) | 2021 |  | 2020
Beginning balance of URA (D) on securities | $ | 724,159 |  | $ | 304,425
Current period change in URA (D) of investments - non-credit related |  | (484,762) |  |  | 419,734
Ending balance of URA (D) on securities |  | 239,397 |  |  | 724,159
Beginning balance of foreign currency translation adjustments |  | (115,390) |  |  | (201,717)
Current period change in foreign currency translation adjustments |  | (62,091) |  |  | 86,327
Ending balance of foreign currency translation adjustments |  | (177,481) |  |  | (115,390)
Beginning balance of benefit plan net gain (loss) |  | (73,870) |  |  | (74,556)
Current period change in benefit plan net gain (loss) |  | 23,478 |  |  | 685
Ending balance of benefit plan net gain (loss) |  | (50,392) |  |  | (73,870)
Ending balance of accumulated other comprehensive income (loss) | $ | 11,523 |  | $ | 534,899
(Some amounts may not reconcile due to rounding.) |  |  |  |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e526-108580 + Details
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