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Investments (Investment Income Net of Related Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 702,416 | $ 596,035 | $ 1,912,026 | $ 1,684,151
Investment expense | (23,611) | (23,293) | (69,266) | (67,019)
Investment income, net of related expenses | 678,805 | 572,742 | 1,842,760 | 1,617,132
Available-for-sale Securities [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 464,431 | 378,669 | 1,307,359 | 1,121,496
Equity securities |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 1,709 | 1,319 | 3,600 | 3,710
Mortgage Loans on Real Estate [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 67,071 | 54,424 | 187,142 | 155,083
Policy loans |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 14,580 | 14,730 | 43,083 | 44,285
Funds withheld at interest |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 81,862 | 108,232 | 209,568 | 270,094
Short-term Investments [Member] |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | 6,152 | 3,067 | 20,517 | 9,276
Other invested assets |  |  |  |
Major Categories Of Investment Income Net of Expenses [Line Items] |  |  |  |
Investment revenue | $ 66,611 | $ 35,594 | $ 140,757 | $ 80,207

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