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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 28,065 | $ 17,608 | $ 20,275 | $ 21,857 | $ (67,332) | $ (21,132) | $ 37,127 | $ 18,531 | $ 87,927 | $ (32,805) | $ (61,731)
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 |  |  |  |  |  |  |  |  | 50,403 | (56,584) | (39,304)
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 |  |  |  |  |  |  |  |  | 37,486 | 23,722 | (22,988)
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 |  |  |  |  |  |  |  |  | $ 38 | $ 57 | $ 561

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&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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