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Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 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 | $ 44,783 | $ (64,312) | $ 69,338 | $ (22,878)
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 | 19,198 | 25,525 | 50,013 | 49,834
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 | 25,629 | (87,009) | 20,153 | (69,858)
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 | $ (44) | $ (2,828) | $ (828) | $ (2,854)

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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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