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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year |  | $ 708,284 | $ 1,657,129 | $ 1,005,607
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 675,627 | (1,349,528) | 1,037,395
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (63,800) | 78,998 | (28,949)
Other Comprehensive Income (Loss), Tax |  | (180,782) | 321,685 | (356,924)
Balance, end of year |  | 1,139,329 | 708,284 | 1,657,129
Accumulated Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year |  | (181,151) | 81,847 | 207,083
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 29,691 | (246,520) | (102,238)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Tax |  | (21,081) | (16,478) | (22,998)
Balance, end of year |  | (172,541) | (181,151) | 81,847
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year | [1] | 935,697 | 1,624,773 | 820,245
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | [1] | 646,887 | (1,101,760) | 1,185,321
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | [1] | 69,622 | (72,795) | 32,097
Other Comprehensive Income (Loss), Tax | [1] | (157,929) | 339,889 | (348,696)
Balance, end of year | [1] | 1,355,033 | 935,697 | 1,624,773
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |
Balance, beginning of year |  | (46,262) | (49,491) | (21,721)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | (951) | (1,248) | (45,688)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  | (5,822) | (6,203) | (3,148)
Other Comprehensive Income (Loss), Tax |  | (1,772) | (1,726) | 14,770
Balance, end of year |  | $ (43,163) | $ (46,262) | $ (49,491)
[1] | Includes cash flow hedges of $(2,496), $(29,397) and $(31,591) as of December 31, 2016, 2015 and 2014, respectively. See Note 5 for additional information on cash flow hedges.

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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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=66004124&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=66004124&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=66004124&loc=SL7669686-108580 + Details
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