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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated other comprehensive income $ 1,985,374 $ 1,149,364 $ 708,284 $ 1,657,129
Other Comprehensive Income (Loss), before Reclassifications, before Tax 1,853,044 (700,801)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (20,899) (4,227)    
Other Comprehensive Income (Loss), Tax 555,055 (197,263)    
Accumulated Translation Adjustment [Member]        
Accumulated other comprehensive income (93,476) (13,989) (181,151) 81,847
Other Comprehensive Income (Loss), before Reclassifications, before Tax 99,374 (89,220)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 0 0    
Other Comprehensive Income (Loss), Tax (11,699) (6,616)    
Accumulated Net Unrealized Investment Gain (Loss) [Member]        
Accumulated other comprehensive income [1] 2,126,815 1,211,056 935,697 1,624,773
Other Comprehensive Income (Loss), before Reclassifications, before Tax [1] 1,759,753 (612,314)    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax [1] (24,366) (6,192)    
Other Comprehensive Income (Loss), Tax [1] 544,269 (204,789)    
Accumulated Defined Benefit Plans Adjustment [Member]        
Accumulated other comprehensive income (47,965) (47,703) $ (46,262) $ (49,491)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (6,083) 733    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax 3,467 1,965    
Other Comprehensive Income (Loss), Tax $ (913) $ 910    
[1] Includes cash flow hedges of $(41,192) and $(29,397) as of June 30, 2016 and December 31, 2015, respectively, and $(23,901) and $(31,591) as of June 30, 2015 and December 31, 2014, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.