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Comprehensive Income (Components of Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year | $ (86,618) | $ 50,985 | $ (28,658) |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap | 26,226 | (13,305) | 3,158 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (60,392) | 37,680 | (25,500) |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year | (1,054,227) | 511,268 | 816,452 | [1]
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized | 6,081 | 59,363 | 47,347 | [1]
Change in net unrealized gain on investments | (1,060,308) | 451,905 | 769,105 | [1]
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income | 2,896 | 6,434 | (1,236) |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year | 354 | 203 | 275 |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period | 14,155 | (5,473) | (16,675) |
Changes in pension and other postretirement plan adjustments | 14,509 | (5,270) | (16,400) |
Other Comprehensive Income (Loss), Net of Tax | (1,103,295) | 490,749 | 725,969 |
Before Tax Amount [Member] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year | (88,409) | 57,229 | (28,779) |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap | 40,347 | (20,470) | 4,858 |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (48,062) | 36,759 | (23,921) |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year | (1,519,967) | 786,449 | 1,118,586 | [1]
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized | 9,355 | 91,327 | 72,841 | [1]
Change in net unrealized gain on investments | (1,529,322) | 695,122 | 1,045,745 | [1]
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income | 4,456 | 9,899 | (1,901) |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year | 525 | 298 | 460 |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period | 21,624 | (8,347) | (25,441) |
Changes in pension and other postretirement plan adjustments | 22,149 | (8,049) | (24,981) |
Other Comprehensive Income (Loss), Net of Tax | (1,550,779) | 733,731 | 994,942 |
Tax Expense Benefit [Member] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year | 1,791 | (6,244) | 121 |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap | (14,121) | 7,165 | (1,700) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | (12,330) | 921 | (1,579) |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year | 465,740 | (275,181) | (302,134) | [1]
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized | (3,274) | (31,964) | (25,494) | [1]
Change in net unrealized gain on investments | 469,014 | (243,217) | (276,640) | [1]
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income | (1,560) | (3,465) | 665 |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year | (171) | (95) | (185) |
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period | (7,469) | 2,874 | 8,766 |
Changes in pension and other postretirement plan adjustments | (7,640) | 2,779 | 8,581 |
Other Comprehensive Income (Loss), Net of Tax | 447,484 | (242,982) | (268,973) |
Accumulated Currency Translation Adjustments [Member] |  |  |  |
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | $ (60,392) |  |  |
[1] | Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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