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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Balance, Beginning of Period |  | $ 2,063,631 | $ 1,139,329
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (823,915) | 232,681
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 22,620 | 7,218
Other Comprehensive Income (Loss), Tax |  | (166,060) | 58,073
Balance, End of Period |  | 1,428,396 | 1,321,155
Accumulated Translation Adjustment [Member] |  |  |
Balance, Beginning of Period |  | (86,350) | (172,541)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | 5,696 | (50,735)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 0 | 0
Other Comprehensive Income (Loss), Tax |  | (6,856) | 28,522
Balance, End of Period |  | (87,510) | (194,754)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Balance, Beginning of Period | [1] | 2,200,661 | 1,355,033
Other Comprehensive Income (Loss), before Reclassifications, before Tax | [1] | (827,701) | 283,443
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [1] | 21,274 | 5,762
Other Comprehensive Income (Loss), Tax | [1] | (172,823) | 86,090
Balance, End of Period | [1] | 1,567,057 | 1,558,148
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Balance, Beginning of Period |  | (50,680) | (43,163)
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  | (1,910) | (27)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 1,346 | 1,456
Other Comprehensive Income (Loss), Tax |  | (93) | 505
Balance, End of Period |  | $ (51,151) | $ (42,239)
[1] | Includes cash flow hedges of $20,662 and $2,619 as of March 31, 2018 and December 31, 2017, respectively, and $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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