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Equity (Components of Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 |  | $ 39,925 | $ (342,539) | $ (154,132)
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax |  | (24,663) | 17,129 | (4,835)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax |  | 15,262 | (325,410) | (158,967)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap, Before Reclassification and Tax |  | (10,234) | 96,019 | 51,894
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Tax |  | 3,582 | (33,607) | (18,163)
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap Net Of Tax |  | (6,652) | 62,412 | 33,731
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  | 29,691 | (246,520) | (102,238)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  | (21,081) | (16,478) | (22,998)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax |  | 8,610 | (262,998) | (125,236)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | [1] | 641,606 | (1,084,732) | 1,177,017
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | [1] | (180,448) | 359,407 | (357,024)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | [1] | 461,158 | (725,325) | 819,993
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, before Tax | [1] | 65,798 | (55,767) | 26,405
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax | [1] | (23,029) | 19,518 | (9,242)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax | [1] | 42,769 | (36,249) | 17,163
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax | [1] | 575,808 | (1,028,965) | 1,150,612
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] | (157,419) | 339,889 | (347,782)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | [1] | 418,389 | (689,076) | 802,830
Other than Temporary Impairment Loss, Investments, Portion in Other Comprehensive Loss, before Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 1,457 |  | (2,612)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Tax, Portion Attributable to Parent, Available-for-sale Securities |  | (510) |  | (914)
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Portion Attributable to Parent, Available-for-sale Securities |  | 947 |  | 1,698
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax |  | 444 | 337 | 485
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax |  | (149) | (107) | (159)
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax |  | 295 | 230 | 326
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax |  | 4,427 | 4,618 | (43,025)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Tax |  | (1,623) | (1,619) | 14,929
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax |  | 2,804 | 2,999 | (28,096)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  | 4,871 | 4,955 | (42,540)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  | (1,772) | (1,726) | 14,770
Defined benefit pension and postretirement plan adjustments |  | 3,099 | 3,229 | (27,770)
Other Comprehensive Income (Loss), before Tax |  | 611,827 | (1,270,530) | 1,008,446
Other Comprehensive Income (Loss), Tax |  | (180,782) | 321,685 | (356,924)
Other Comprehensive Income (Loss), Net of Tax |  | $ 431,045 | $ (948,845) | $ 651,522
[1] | Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.

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