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Comprehensive Income (Balance of and Changes in Each Component of AOCI) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Accumulated Currency Translation Adjustments [Member] | Dec. 31, 2012 Accumulated Currency Translation Adjustments [Member] | Dec. 31, 2011 Accumulated Currency Translation Adjustments [Member] | Dec. 31, 2010 Accumulated Currency Translation Adjustments [Member] | Dec. 31, 2013 Unrealized Appreciation Of Securities [Member] | Dec. 31, 2012 Unrealized Appreciation Of Securities [Member] | Dec. 31, 2011 Unrealized Appreciation Of Securities [Member] | Dec. 31, 2010 Unrealized Appreciation Of Securities [Member] | Dec. 31, 2013 Pension And Postretirement Benefits [Member] | Dec. 31, 2012 Pension And Postretirement Benefits [Member] | Dec. 31, 2011 Pension And Postretirement Benefits [Member] | Dec. 31, 2010 Pension And Postretirement Benefits [Member] | Dec. 31, 2013 Unrealized Appreciation Depreciation Of Investments [Member] Unrealized Appreciation Of Securities [Member]
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax | $ (60,392) |  | $ 37,680 |  | $ (25,500) |  | $ (60,392) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year | 2,108,902 |  | 1,618,153 |  | 892,184 |  | 267,475 |  |  |  | 229,795 |  | 255,295 | 1,877,657 |  |  |  | 1,419,318 |  | 651,449 | (36,230) |  |  |  | (30,960) |  | (14,560) |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (60,392) |  | 37,680 |  | (25,500) |  |  |  | 37,680 |  | (25,500) |  |  | 0 |  | 0 |  | 0 |  |  | 0 |  | 0 |  | 0 |  |  |
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax | (1,063,377) | [1] | 451,905 | [1] | 769,105 | [1] | 0 | [1] | 0 | [1] | 0 | [1] |  | (1,063,377) | [1] | 451,905 | [1] | 769,105 | [1] |  | 0 | [1] | 0 | [1] | 0 | [1] |  |
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities | 2,896 |  | 6,434 |  | (1,236) |  | 0 |  | 0 |  | 0 |  |  |  |  | 6,434 |  | (1,236) |  |  | 0 |  | 0 |  | 0 |  |  |
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income | 2,896 |  | 6,434 |  | (1,236) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,896
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | 11,577 |  | (5,270) |  | (16,400) |  | 0 |  | 0 |  | 0 |  |  | 0 |  | 0 |  | 0 |  |  | 11,577 |  | (5,270) |  | (16,400) |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 6,001 |  |  |  |  |  | 0 |  |  |  |  |  |  | 3,069 |  |  |  |  |  |  | 2,932 |  |  |  |  |  |  |
Balance, end of year | $ 1,005,607 |  | $ 2,108,902 |  | $ 1,618,153 |  | $ 207,083 |  |  |  | $ 229,795 |  | $ 255,295 | $ 820,245 |  |  |  | $ 1,419,318 |  | $ 651,449 | $ (21,721) |  |  |  | $ (30,960) |  | $ (14,560) |
[1] | Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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