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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 | 6 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 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 | $ (24,788) | $ 20,597 | $ 24,555 | $ 41,434
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 | 9,812 | 33,879 | 30,815 | 24,309
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 | (33,972) | (13,237) | (5,476) | 17,151
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 | $ (628) | $ (45) | $ (784) | $ (26)

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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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