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Investments (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments | $ 18,173 | $ 24,021 | $ 50,281 | $ 104,227 | $ (70,020) | $ (12,907) | $ 8,793 | $ (58,532) | $ 196,594 | $ (132,658) | $ 87,927
Fixed Maturity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | 104,379 | (53,927) | 50,403
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | 90,920 | (77,494) | 37,486
Short-term Investments [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains and losses due to changes in fair value of investments |  |  |  |  |  |  |  |  | $ 1,295 | $ (1,237) | $ 38

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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