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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Balance, Beginning of Period $ 1,139,329 $ 708,284
Other Comprehensive Income (Loss), before Reclassifications, before Tax 232,681 848,056
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 7,218 11,788
Other Comprehensive Income (Loss), Tax 58,073 237,745
Balance, End of Period 1,321,155 1,330,383
Accumulated Translation Adjustment [Member]    
Balance, Beginning of Period (172,541) (181,151)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (50,735) 72,695
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0
Other Comprehensive Income (Loss), Tax 28,522 5,038
Balance, End of Period (194,754) (103,418)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Balance, Beginning of Period [1] 1,355,033 935,697
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] 283,443 781,293
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] 5,762 10,237
Other Comprehensive Income (Loss), Tax [1] 86,090 244,305
Balance, End of Period [1] 1,558,148 1,482,922
Accumulated Defined Benefit Plans Adjustment [Member]    
Balance, Beginning of Period (43,163) (46,262)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (27) (5,932)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 1,456 1,551
Other Comprehensive Income (Loss), Tax 505 (1,522)
Balance, End of Period $ (42,239) $ (49,121)
[1] Includes cash flow hedges of $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively, and $(21,794) and $(29,397) as of March 31, 2016 and December 31, 2015, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.