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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2021
Other Comprehensive Income (Loss) [Abstract] |
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations |
| Three Months Ended June 30, 2021 |  | Six Months Ended June 30, 2021
(Dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related | $ | 94,009 |  | $ | (9,838) |  | $ | 84,171 |  | $ | (235,157) |  | $ | 30,713 |  | $ | (204,444)
Reclassification of net realized losses (gains) included in net income (loss) |  | 3,118 |  |  | (1,528) |  |  | 1,590 |  |  | (424) |  |  | (1,652) |  |  | (2,076)
Foreign currency translation adjustments |  | 38,022 |  |  | (3,727) |  |  | 34,295 |  |  | 29,034 |  |  | (4,321) |  |  | 24,713
Reclassification of benefit plan liability amortization included in net income (loss) |  | 2,586 |  |  | (543) |  |  | 2,043 |  |  | 5,172 |  |  | (1,086) |  |  | 4,086
Total other comprehensive income (loss) | $ | 137,735 |  | $ | (15,636) |  | $ | 122,099 |  | $ | (201,375) |  | $ | 23,654 |  | $ | (177,721)
| Three Months Ended June 30, 2020 |  | Six Months Ended June 30, 2020
(Dollars in thousands) | Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized appreciation (depreciation) ("URA(D)") on securities - non-credit related | $ | 620,926 |  | $ | (69,173) |  | $ | 551,753 |  | $ | 305,725 |  | $ | (33,371) |  | $ | 272,354
Reclassification of net realized losses (gains) included in net income (loss) |  | (6,849) |  |  | (408) |  |  | (7,257) |  |  | 31,328 |  |  | (7,186) |  |  | 24,142
Foreign currency translation adjustments |  | 22,825 |  |  | (2,239) |  |  | 20,586 |  |  | (35,898) |  |  | 5,660 |  |  | (30,238)
Reclassification of benefit plan liability amortization included in net income (loss) |  | 2,286 |  |  | (480) |  |  | 1,806 |  |  | 3,451 |  |  | (725) |  |  | 2,726
Total other comprehensive income (loss) | $ | 639,188 |  | $ | (72,300) |  | $ | 566,888 |  | $ | 304,606 |  | $ | (35,622) |  | $ | 268,984
Reclassification From Accumulated Other Comprehensive Income |
|  | Three Months Ended |  | Six Months Ended |  |
|  | June 30, |  | June 30, |  | Affected line item within the statements of
AOCI component |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | operations and comprehensive income (loss)
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |
URA(D) on securities |  | $ | 3,118 |  | $ | (6,849) |  | $ | (424) |  | $ | 31,328 |  | Other net realized capital gains (losses)
|  |  | (1,528) |  |  | (408) |  |  | (1,652) |  |  | (7,186) |  | Income tax expense (benefit)
|  | $ | 1,590 |  | $ | (7,257) |  | $ | (2,076) |  | $ | 24,142 |  | Net income (loss)
Benefit plan net gain (loss) |  | $ | 2,586 |  | $ | 2,286 |  | $ | 5,172 |  | $ | 3,451 |  | Other underwriting expenses
|  |  | (543) |  |  | (480) |  |  | (1,086) |  |  | (725) |  | Income tax expense (benefit)
|  | $ | 2,043 |  | $ | 1,806 |  | $ | 4,086 |  | $ | 2,726 |  | Net income (loss)
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax, In The Consolidated Balance Sheets |
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020
Beginning balance of URA (D) on securities | $ | 431,878 |  | $ | 56,426 |  | $ | 724,159 |  | $ | 304,425
Current period change in URA (D) of investments - non-credit related |  | 85,761 |  |  | 544,496 |  |  | (206,520) |  |  | 296,496
Ending balance of URA (D) on securities |  | 517,639 |  |  | 600,922 |  |  | 517,639 |  |  | 600,922
Beginning balance of foreign currency translation adjustments |  | (124,972) |  |  | (252,541) |  |  | (115,390) |  |  | (201,717)
Current period change in foreign currency translation adjustments |  | 34,295 |  |  | 20,586 |  |  | 24,713 |  |  | (30,238)
Ending balance of foreign currency translation adjustments |  | (90,677) |  |  | (231,955) |  |  | (90,677) |  |  | (231,955)
Beginning balance of benefit plan net gain (loss) |  | (71,827) |  |  | (73,636) |  |  | (73,870) |  |  | (74,556)
Current period change in benefit plan net gain (loss) |  | 2,043 |  |  | 1,806 |  |  | 4,086 |  |  | 2,726
Ending balance of benefit plan net gain (loss) |  | (69,784) |  |  | (71,830) |  |  | (69,784) |  |  | (71,830)
Ending balance of accumulated other comprehensive income (loss) | $ | 357,178 |  | $ | 297,137 |  | $ | 357,178 |  | $ | 297,137
(Some amounts may not reconcile due to rounding.) |  |  |  |  |  |

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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=121641772&loc=d3e526-108580 + Details
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