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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2019
Other Comprehensive Income (Loss) [Abstract] |
Components Of Comprehensive Income (Loss) In The Consolidated Statements Of Operations |
| Years Ended December 31, 2019
| 2019 |  | 2018 |  | 2017
(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 - temporary | $ | 547,539 |  | $ | (49,665) |  | $ | 497,874 |  | $ | (275,511) |  | $ | 21,061 |  | $ | (254,450) |  | $ | (81,915) |  | $ | 21,597 |  | $ | (60,318)
URA(D) on securities - OTTI |  | (1,559) |  |  | 115 |  |  | (1,444) |  |  | (1,071) |  |  | (135) |  |  | (1,206) |  |  | (5,618) |  |  | 1,588 |  |  | (4,030)
Reclassification of net realized losses (gains) included in net income (loss) |  | (13,129) |  |  | 516 |  |  | (12,613) |  |  | 28,014 |  |  | (518) |  |  | 27,496 |  |  | (7,258) |  |  | 308 |  |  | (6,950)
Foreign currency translation adjustments |  | 18,585 |  |  | (4,555) |  |  | 14,030 |  |  | (86,520) |  |  | 9,704 |  |  | (76,816) |  |  | 142,054 |  |  | (20,137) |  |  | 121,917
Benefit plan actuarial net gain (loss) |  | (15,938) |  |  | 3,347 |  |  | (12,591) |  |  | (646) |  |  | 136 |  |  | (510) |  |  | 1,300 |  |  | (273) |  |  | 1,027
Reclassification of benefit plan liability amortization included in net income (loss) |  | 6,902 |  |  | (1,449) |  |  | 5,453 |  |  | 6,356 |  |  | (1,335) |  |  | 5,021 |  |  | 8,426 |  |  | (2,949) |  |  | 5,477
Total other comprehensive income (loss) | $ | 542,400 |  | $ | (51,691) |  | $ | 490,709 |  | $ | (329,378) |  | $ | 28,913 |  | $ | (300,465) |  | $ | 56,989 |  | $ | 134 |  | $ | 57,123
Reclassification From Accumulated Other Comprehensive Income |
| Years Ended |  |
| December 31, |  | Affected line item within the statements of
AOCI component | 2019 |  | 2018 |  | operations and comprehensive income (loss)
(Dollars in thousands) |  |  |  |  |  |  |
URA(D) on securities | $ | (13,129) |  | $ | 28,014 |  | Other net realized capital gains (losses)
|  | 516 |  |  | (518) |  | Income tax expense (benefit)
| $ | (12,613) |  | $ | 27,496 |  | Net income (loss)
Benefit plan net gain (loss) | $ | 6,902 |  | $ | 6,356 |  | Other underwriting expenses
|  | (1,449) |  |  | (1,335) |  | Income tax expense (benefit)
| $ | 5,453 |  | $ | 5,021 |  | 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) | 2019 |  | 2018
Beginning balance of URA (D) on securities | $ | (179,392) |  | $ | 49,969
Change to beginning balance due to adoption of ASU 2016-01 |  | - |  |  | (1,201)
Current period change in URA (D) of investments - temporary |  | 485,261 |  |  | (226,954)
Current period change in URA (D) of investments - non-credit OTTI |  | (1,444) |  |  | (1,206)
Ending balance of URA (D) on securities |  | 304,425 |  |  | (179,392)
Beginning balance of foreign currency translation adjustments |  | (215,747) |  |  | (138,931)
Current period change in foreign currency translation adjustments |  | 14,030 |  |  | (76,816)
Ending balance of foreign currency translation adjustments |  | (201,717) |  |  | (215,747)
Beginning balance of benefit plan net gain (loss) |  | (67,418) |  |  | (71,929)
Current period change in benefit plan net gain (loss) |  | (7,138) |  |  | 4,511
Ending balance of benefit plan net gain (loss) |  | (74,556) |  |  | (67,418)
Ending balance of accumulated other comprehensive income (loss) | $ | 28,152 |  | $ | (462,557)
(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=118930883&loc=d3e526-108580 + Details
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