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Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | $ 50,281 | $ 8,793 | $ 154,508 | $ (49,738)
Fixed maturity securities [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 38,382 | 224 | 88,157 | (45,988)
Equity Securities [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 11,361 | 8,533 | 65,048 | (3,354)
Short-term investments [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 491 | 44 | 1,225 | (347)
Investments [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | 50,234 | 8,801 | 154,430 | (49,689)
Financing Receivable [Member] |  |  |  |
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | $ 47 | $ (8) | $ 78 | $ (49)

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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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