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Investments (Details 9) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
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%