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Income Tax (Tax Effects of Temporary Differences that Give Rise to Significant Portions of the Deferred Income Tax Asset and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Deferred Tax Assets, Net [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | $ 125,879 | $ 116,106
Deferred Tax Assets Reinsurance Transactions | 87,688 | 63,543
Deferred Tax Assets Cash And Invested Assets | 775 | 5,931
Deferred Tax Assets Investment Income | 35,192 | 0
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Tax | 143,003 | 131,714
Deferred Tax Assets, Operating Loss Carryforwards | 325,806 | 524,501
Deferred Tax Assets Deferred Acquisition Costs Capitalized For Financial Reporting | 101,223 | 77,888
Deferred Tax Assets, Gross | 819,566 | 919,683
Deferred Tax Assets, Valuation Allowance | (133,354) | (127,132)
Deferred Tax Assets, Net | 686,212 | 792,551
Deferred Tax Liabilities [Abstract] |  |
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost | 1,013,642 | 1,011,753
Deferred Tax Liabilities Reinsurance Transactions | 1,773,929 | 1,509,211
Deferred Tax Liabilities Cash And Invested Assets | 505,841 | 336,870
Deferred Tax Liabilities Investment Income | 5,635 | 14,654
Deferred Tax Liabilities, Unrealized Currency Transaction Gains | 91,067 | 81,492
Deferred Tax Liabilities, Prepaid Expenses | 0 | 1,014
Deferred Tax Liabilities | 3,390,114 | 2,954,994
Net deferred income tax liabilities | 2,703,902 | 2,162,443
Balance Sheet Presentation Of Deferred Tax Liabilities [Abstract] |  |
Deferred Tax Assets, Other | 66,738 | 55,885
Deferred income taxes | $ 2,770,640 | $ 2,218,328

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