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Investments (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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 | $ (30,593) | $ 21,815 | $ (78,726) | $ 43,467 | $ (28,944) | $ 44,783 | $ (24,788) | $ 49,343 | $ (44,037) | $ 45,509 | $ 31,289
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 |  |  |  |  |  |  |  |  | (100,703) | 36,317 | 62,149
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 |  |  |  |  |  |  |  |  | 56,822 | 9,158 | (30,879)
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 |  |  |  |  |  |  |  |  | $ (156) | $ 34 | $ 19

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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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