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Investments (Details 8) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Gross unrealized losses with number of securities [Line Items]
Available For Sale Securities Gross Unrealized Losses	$ 153,700,000	$ 292,486,000
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	55,930,000	131,155,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	36.40%	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	509,000	51,503,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	0.30%	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	$ 97,261,000	$ 109,828,000
Percentage Of Total Gross Unrealized Losses For Fixed Maturity And Equity Securities	63.30%	37.60%