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Investments (Gross Gains And Losses Realized On Sales Of Investments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Fixed Maturity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Gross Realized Gains | $ 604 | $ 3,327 | $ 631
Gross Realized Losses | (2,701) | (19,133) | (495)
Net | (2,097) | (15,806) | 136
Equity Securities [Member] |  |  |
Investments [Line Items] |  |  |
Gross Realized Gains | 20,835 | 29,446 | 41,305
Gross Realized Losses | (23,048) | (29,945) | (58,764)
Net | (2,213) | (499) | (17,459)
Short-term Investments [Member] |  |  |
Investments [Line Items] |  |  |
Gross Realized Gains | 21 | 6 | 0
Gross Realized Losses | (20) | (530) | (1,396)
Net | $ 1 | $ (524) | $ (1,396)

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- Definition This item represents the gain realized during the period from the sale of trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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