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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 188,124 | $ 148,243 | $ 333,821 | $ 293,190
Funds held interest income (expense) | 1,422 | 1,939 | 7,390 | 5,569
Future policy benefit reserve income (expense) | (359) | (359) | (593) | (568)
Gross investment income | 189,187 | 149,823 | 340,618 | 298,191
Investment expenses | (10,159) | (8,501) | (20,614) | (18,575)
Net investment income | 179,028 | 141,322 | 320,004 | 279,616
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 126,593 | 114,824 | 253,301 | 223,506
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 4,596 | 6,672 | 8,103 | 13,499
Short Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 5,393 | 2,092 | 9,598 | 3,824
Limited Partnerships [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 48,243 | 21,996 | 56,540 | 45,377
Other [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 3,299 | $ 2,659 | $ 6,279 | $ 6,984

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