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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Balance, Beginning of Period $ 708,284 $ 1,657,129
Other Comprehensive Income (Loss), before Reclassifications, before Tax 848,056 391,626
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 11,788 (7,465)
Other Comprehensive Income (Loss), Tax 237,745 157,054
Balance, End of Period 1,330,383 1,884,236
Accumulated Translation Adjustment [Member]    
Balance, Beginning of Period (181,151) 81,847
Other Comprehensive Income (Loss), before Reclassifications, before Tax 72,695 (103,285)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0
Other Comprehensive Income (Loss), Tax 5,038 (14,486)
Balance, End of Period (103,418) (35,924)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Balance, Beginning of Period [1] 935,697 1,624,773
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] 781,293 494,294
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 10,237 (8,252)
Other Comprehensive Income (Loss), Tax [1] 244,305 142,118
Balance, End of Period [1] 1,482,922 1,968,697
Accumulated Defined Benefit Plans Adjustment [Member]    
Balance, Beginning of Period (46,262) (49,491)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (5,932) 617
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1,551 787
Other Comprehensive Income (Loss), Tax (1,522) 450
Balance, End of Period $ (49,121) $ (48,537)
[1] Includes cash flow hedges of $(21,794) and $(29,397) as of March 31, 2016 and December 31, 2015, respectively, and $(30,598) and $(31,591) as of March 31, 2015 and December 31, 2014, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.