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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Balance, Beginning of Period |  | $ 636,763 | $ 2,063,631
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 1,453,733 | (823,915)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | (13,408) | 22,620
Other Comprehensive Income (Loss), Tax |  | 311,123 | (166,060)
Balance, End of Period |  | 1,765,965 | 1,428,396
Accumulated Translation Adjustment [Member] |  |  |
Balance, Beginning of Period |  | (168,698) | (86,350)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 18,462 | 5,696
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 0
Other Comprehensive Income (Loss), Tax |  | 2,924 | (6,856)
Balance, End of Period |  | (147,312) | (87,510)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Balance, Beginning of Period | [1] | 856,159 | 2,200,661
Other Comprehensive Income (Loss), before Reclassifications, before Tax | [1] | 1,437,058 | (827,701)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] | (14,694) | 21,274
Other Comprehensive Income (Loss), Tax | [1] | 314,153 | (172,823)
Balance, End of Period | [1] | 1,964,370 | 1,567,057
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Balance, Beginning of Period |  | (50,698) | (50,680)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (1,787) | (1,910)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 1,286 | 1,346
Other Comprehensive Income (Loss), Tax |  | (106) | (93)
Balance, End of Period |  | $ (51,093) | $ (51,151)
[1] | Includes cash flow hedges of $(1,902) and $8,788 as of March 31, 2019 and December 31, 2018, respectively, and $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 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=114867106&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e681-108580 + Details
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