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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated other comprehensive income |  | $ 812,805 | $ 3,258,346 | $ 812,805 | $ 636,763 | $ 2,063,631
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | 3,530,571 | (1,666,514) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | (166,803) | 83,491 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 0 | (87) | (2,020) |  |
Other Comprehensive Income (Loss), Tax |  |  | (742,185) | 334,770 |  |
Accumulated Translation Adjustment [Member] |  |  |  |  |  |
Accumulated other comprehensive income |  | (119,298) | (157,174) | (119,298) | (168,698) | (86,350)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | 16,155 | (24,977) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 0 | 0 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | (2,573) |  |
Other Comprehensive Income (Loss), Tax |  |  | 4,631 | 5,398 |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |
Accumulated other comprehensive income | [1] | 982,352 | 3,472,549 | 982,352 | 856,159 | 2,200,661
Other Comprehensive Income (Loss), before Reclassifications, before Tax | [1] |  | 3,526,151 | (1,638,146) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] |  | (170,531) | 79,505 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | [1] |  |  | 0 |  |
Other Comprehensive Income (Loss), Tax | [1] |  | (739,230) | 340,332 |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |
Accumulated other comprehensive income |  | $ (50,249) | (57,029) | (50,249) | $ (50,698) | $ (50,680)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  | (11,735) | (3,391) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 3,728 | 3,986 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | 0 |  |
Other Comprehensive Income (Loss), Tax |  |  | $ 1,676 | $ (164) |  |
[1] | Includes cash flow hedges of $(47,202) and $8,788 as of September 30, 2019 and December 31, 2018, respectively, and $29,043 and $2,619 as of September 30, 2018 and December 31, 2017, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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