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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | $ (67,332) | $ (21,132) | $ 37,127 | $ 18,531 | $ 2,474 | $ (18,538) | $ (40,783) | $ (4,884) | $ (32,805) | $ (61,731) | $ 43,759
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 |  |  |  |  |  |  |  |  | (56,584) | (39,304) | 77,208
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 |  |  |  |  |  |  |  |  | 23,722 | (22,988) | (32,922)
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 |  |  |  |  |  |  |  |  | $ 57 | $ 561 | $ (527)

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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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