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Investments (Details 9) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Gross unrealized losses with number of securities [Line Items] |  |
Available For Sale Securities Gross Unrealized Losses | $ 196,299 | $ 292,486
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 100.00% | 100.00%
Less Than 20 Percent [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available For Sale Securities Gross Unrealized Losses | 77,198 | 131,155
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 39.30% | 44.80%
More Than Or Equal To 20 Percent For Less Than Six Months [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available For Sale Securities Gross Unrealized Losses | 6,739 | 51,503
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 3.40% | 17.60%
More Than Or Equal To 20 Percent For Six Months Or Greater [Member] |  |
Gross unrealized losses with number of securities [Line Items] |  |
Available For Sale Securities Gross Unrealized Losses | $ 112,362 | $ 109,828
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 57.30% | 37.60%

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