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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year $ 2,063,631 $ 1,139,329 $ 708,284
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (1,926,681) 1,062,087 675,627
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 153,688 (29,057) (63,800)
Other Comprehensive Income (Loss), Tax 348,698 (265,100) (180,782)
Balance, end of year 636,763 2,063,631 1,139,329
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 2,600 156,400  
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year (86,350) (172,541) (181,151)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (60,674) 26,973 29,691
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0 0
Other Comprehensive Income (Loss), Tax (19,101) 42,153 (21,081)
Balance, end of year (168,698) (86,350) (172,541)
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year [1] 2,200,661 1,355,033 935,697
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [1] (1,860,789) 1,039,387 646,887
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (148,354) 34,460 69,622
Other Comprehensive Income (Loss), Tax [1] 367,933 (306,849) (157,929)
Balance, end of year [1] 856,159 2,200,661 1,355,033
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year (50,680) (43,163) (46,262)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (5,218) (4,273) (951)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (5,334) (5,403) (5,822)
Other Comprehensive Income (Loss), Tax (134) (404) (1,772)
Balance, end of year (50,698) (50,680) $ (43,163)
Accounting Standards Update 2018 02 [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (2,020) 17,723  
Accounting Standards Update 2018 02 [Member] | Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification (2,573) 17,065  
Accounting Standards Update 2018 02 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 0 147,550  
Accounting Standards Update 2018 02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 0 (8,243)  
Accounting Standards Update 2018 02 [Member] | AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification $ (2,573) $ 156,372  
[1] Includes cash flow hedges of $8,788, $2,619 and $(2,496) as of December 31, 2018, 2017 and 2016, respectively. See Note 5 for additional information on cash flow hedges.