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Investments (Details 7) (USD $)	Mar. 31, 2013	Dec. 31, 2012
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%