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Equity (Balance of and Changes in Each Component of AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year $ 1,657,129 $ 1,005,607 $ 2,108,902
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (1,349,528) 1,037,395 (1,561,104)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 78,998 (28,949) 10,325
Other Comprehensive Income (Loss), Tax 321,685 (356,924) 447,484
Balance, end of year 708,284 1,657,129 1,005,607
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year 81,847 207,083 267,475
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (246,520) (102,238) (48,062)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0 0 0
Other Comprehensive Income (Loss), Tax (16,478) (22,998) (12,330)
Balance, end of year (181,151) 81,847 207,083
Accumulated Net Unrealized Investment Gain (Loss) [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year [1] 1,624,773 820,245 1,877,657
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax [1] (1,101,760) 1,185,321 (1,530,680)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (72,795) 32,097 (5,814)
Other Comprehensive Income (Loss), Tax [1] 339,889 (348,696) 467,454
Balance, end of year [1] 935,697 1,624,773 820,245
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]      
Balance, beginning of year (49,491) (21,721) (36,230)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (1,248) (45,688) 17,638
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (6,203) (3,148) (4,511)
Other Comprehensive Income (Loss), Tax (1,726) 14,770 (7,640)
Balance, end of year $ (46,262) $ (49,491) $ (21,721)
[1] Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.