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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items] |  |  |  |
(Losses) gains due to changes in fair value of investments | $ 8,793 | $ 20,275 | $ (49,738) | $ 42,131
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 | 224 | 25,622 | (45,988) | 35,909
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 | 8,533 | (5,080) | (3,354) | 6,462
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 | 44 | (267) | (347) | (240)
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 | 8,801 | 20,275 | (49,689) | 42,131
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 | $ (8) | $ 0 | $ (49) | $ 0

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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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