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Equity (Components of Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]      
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax $ 74,926 $ 39,925 $ (342,539)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax 25,369 (24,663) 17,129
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax 100,295 15,262 (325,410)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax (47,953) (10,234) 96,019
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax 16,784 3,582 (33,607)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax (31,169) (6,652) 62,412
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax 26,973 29,691 (246,520)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax 42,153 (21,081) (16,478)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 69,126 8,610 (262,998)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax [1] 1,029,591 641,606 (1,084,732)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax [1] (313,729) (180,448) 359,407
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax [1] 715,862 461,158 (725,325)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax [1] 25,039 65,798 (55,767)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax [1] (7,011) (23,029) 19,518
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax [1] 18,028 42,769 (36,249)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax [1] 1,004,552 575,808 (1,028,965)
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax [1] (306,718) (157,419) 339,889
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax [1] 697,834 418,389 (689,076)
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities 375 (1,457)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities (131) (510)  
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities 244 947  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 11,717 444 337
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax (4,095) (149) (107)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax 7,622 295 230
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (10,587) 4,427 4,618
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax 3,691 (1,623) (1,619)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (6,896) 2,804 2,999
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax 1,130 4,871 4,955
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax (404) (1,772) (1,726)
Defined benefit pension and postretirement plan adjustments 726 3,099 3,229
Other Comprehensive Income (Loss), before Tax 1,033,030 611,827 (1,270,530)
Other Comprehensive Income (Loss), Tax (265,100) (180,782) 321,685
Other Comprehensive Income (Loss), Net of Tax $ 767,930 $ 431,045 $ (948,845)
[1] Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.