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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 549,734 | $ 537,583 | $ 1,088,116 | $ 1,070,617
Investment expense | (21,673) | (19,045) | (43,726) | (37,715)
Investment income, net of related expenses | 528,061 | 518,538 | 1,044,390 | 1,032,902
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 373,624 | 355,735 | 742,827 | 680,235
Equity securities |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 709 | 995 | 2,391 | 2,354
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 50,460 | 44,442 | 100,659 | 88,789
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 14,775 | 15,194 | 29,555 | 30,466
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 86,417 | 97,367 | 161,862 | 224,945
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 2,964 | 1,779 | 6,209 | 3,289
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 20,785 | $ 22,071 | $ 44,613 | $ 40,539

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