Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Distribution of Maturities for Fixed Maturity Securities Available for Sale
Due in one year or less, Fair value	$ 101,304
Due after one year through five years, Fair Value	665,859
Due after five years through ten years, Fair Value	1,151,964
Due after ten years, Fair Value	532,021
Securities with variable principal payments, Fair Value	349,260
Redeemable preferred stocks, Fair Value	15,842
Fixed maturity securities available for sale, carrying value	2,816,250	2,682,142
Due in one year or less, Amortized Cost	99,536
Due after one year through five years, Amortized Cost	619,948
Due after five years through ten years, Amortized Cost	1,035,701
Due after ten years, Amortized Cost	474,696
Securities with variable principal payments, Amortized Cost	335,158
Redeemable preferred stocks, Amortized Cost	15,736
Available for sale securities, Amortized Cost, total	$ 2,580,775

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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