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Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 |  | $ (148,018) | $ 74,926 | $ 39,925
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  | (759) | 25,369 | (24,663)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | (148,777) | 100,295 | 15,262
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax |  | 87,344 | (47,953) | (10,234)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax |  | (18,342) | 16,784 | 3,582
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax |  | 69,002 | (31,169) | (6,652)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  | (60,674) | 26,973 | 29,691
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | (19,101) | 42,153 | (21,081)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | (79,775) | 69,126 | 8,610
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | [1] | (1,834,656) | 1,029,591 | 641,606
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | [1] | 393,653 | (313,729) | (180,448)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | [1] | (1,441,003) | 715,862 | 461,158
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | [1] | (122,221) | 25,039 | 65,798
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax | [1] | 25,720 | (7,011) | (23,029)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | [1] | (96,501) | 18,028 | 42,769
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments and Tax | [1] | (1,712,435) | 1,004,552 | 575,808
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] | 367,933 | (306,718) | (157,419)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | [1] | (1,344,502) | 697,834 | 418,389
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 |  | (947) | 11,717 | 444
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | 182 | (4,095) | (149)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | (765) | 7,622 | 295
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 1,063 | (10,587) | 4,427
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (316) | 3,691 | (1,623)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 747 | (6,896) | 2,804
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 116 | 1,130 | 4,871
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | (134) | (404) | (1,772)
Defined benefit pension and postretirement plan adjustments |  | (18) | 726 | 3,099
Other Comprehensive Income (Loss), before Tax |  | (1,772,993) | 1,033,030 | 611,827
Other Comprehensive Income (Loss), Tax |  | 348,698 | (265,100) | (180,782)
Other Comprehensive Income (Loss), Net of Tax |  | $ (1,424,295) | $ 767,930 | $ 431,045
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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