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Investments (Details 7) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Gross unrealized losses with number of securities [Line Items] |  |
Available For Sale Securities Gross Unrealized Losses | $ 122,532,000 | $ 133,558,000
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 | 66,235,000 | 54,951,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 54.10% | 41.20%
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 | 0 | 734,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 0.00% | 0.50%
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 | $ 56,297,000 | $ 77,873,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities | 45.90% | 58.30%

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