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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated other comprehensive income |  | $ 812,805 | $ 1,625,757 | $ 2,063,631 | $ 1,139,329
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (1,666,514) | 694,490 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 83,491 | (47,401) |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 2,573 |  | 156,400 |
Other Comprehensive Income (Loss), Tax |  | 334,770 | (160,661) |  |
Accumulated Translation Adjustment [Member] |  |  |  |  |
Accumulated other comprehensive income |  | (119,298) | (104,456) | (86,350) | (172,541)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (24,977) | 23,117 |  |
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 |  | 5,398 | (44,968) |  |
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
Accumulated other comprehensive income | [1] | 982,352 | 1,770,903 | 2,200,661 | 1,355,033
Other Comprehensive Income (Loss), before Reclassifications, before Tax | [1] | (1,638,146) | 671,564 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] | 79,505 | (51,407) |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | [1] | 0 |  |  |
Other Comprehensive Income (Loss), Tax | [1] | 340,332 | (204,287) |  |
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |
Accumulated other comprehensive income |  | (50,249) | (40,690) | $ (50,680) | $ (43,163)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (3,391) | (191) |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 3,986 | 4,006 |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 0 |  |  |
Other Comprehensive Income (Loss), Tax |  | $ (164) | $ (1,342) |  |
[1] | Includes cash flow hedges of $29,043 and $2,619 as of September 30, 2018 and December 31, 2017, respectively, and $347 and $(2,496) as of September 30, 2017 and December 31, 2016, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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