Investments (Details 3) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Amortized cost and fair value of fixed income securities
Due in 1 year or less, Available for sale, Cost or amortized cost	$ 247,391
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,084,679
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,080,746
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	740,889
Due after 15 years, Available for sale, Cost or amortized cost	877,241
Securities with fixed maturities, Available for sale, Cost or amortized cost	4,030,946
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,325,387
Available-for-sale Debt Securities, Amortized Cost Basis	5,356,333	4,864,806
Due in 1 year or less, Available for sale, Fair value	251,201
Due after 1 year through 5 years, Available for sale, Fair value	1,135,759
Due after 5 years through 10 years, Available for sale, Fair value	1,161,310
Due after 10 years through 15 years, Available for sale, Fair value	791,922
Due after 15 years, Available for sale, Fair value	916,008
Securities with fixed maturities, Available for sale, Fair value	4,256,200
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,394,989
Due in 1 year or less, Held to maturity, Amortized cost	56,204
Due after 1 year through 5 years, Held to maturity, Amortized cost	111,560
Due after 5 years through 10 years, Held to maturity, Amortized cost	850
Due after 10 years through 15 years, Held to maturity, Amortized cost	0
Due after 15 years, Held to maturity, Amortized cost	0
Securities with fixed maturities, Held to maturity, Amortized cost	168,614
Mortgage-backed and asset-backed securities, Held to maturity, Amortized cost	0
Total fixed income securities, Held to maturity, Amortized cost	168,614	193,668
Due in 1 year or less, Held to maturity, Fair value	56,501
Due after 1 year through 5 years, Held to maturity, Fair value	113,123
Due after 5 years through 10 years, Held to maturity, Fair value	932
Due after 10 years through 15 years, Held to maturity, Fair value	0
Due after 15 years, Held to maturity, Fair value	0
Securities with fixed maturities, Held to maturity, Fair value	170,556
Mortgage-backed and asset-backed securities, Held to maturity, Fair value	0
Total fixed income securities, Held to maturity, Fair value	$ 170,556	$ 195,811

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