Investments (Details 3) (USD $) In Thousands	Jun. 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	$ 266,293
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,134,360
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,018,126
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	732,546
Due after 15 years, Available for sale, Cost or amortized cost	714,513
Securities with fixed maturities, Available for sale, Cost or amortized cost	3,865,838
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,374,880
Available-for-sale Debt Securities, Amortized Cost Basis	5,240,718	4,864,806
Due in 1 year or less, Available for sale, Fair value	270,110
Due after 1 year through 5 years, Available for sale, Fair value	1,184,638
Due after 5 years through 10 years, Available for sale, Fair value	1,072,105
Due after 10 years through 15 years, Available for sale, Fair value	757,012
Due after 15 years, Available for sale, Fair value	724,828
Securities with fixed maturities, Available for sale, Fair value	4,008,693
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,426,068
Available-for-sale Securities, Debt Securities	5,434,761
Due in 1 year or less, Held to maturity, Amortized cost	54,730
Due after 1 year through 5 years, Held to maturity, Amortized cost	118,389
Due after 5 years through 10 years, Held to maturity, Amortized cost	874
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	173,993
Mortgage-backed and asset-backed securities, Held to maturity, Amortized cost	0
Total fixed income securities, Held to maturity, Amortized cost	173,993	193,668
Due in 1 year or less, Held to maturity, Fair value	55,257
Due after 1 year through 5 years, Held to maturity, Fair value	120,204
Due after 5 years through 10 years, Held to maturity, Fair value	921
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	176,352
Mortgage-backed and asset-backed securities, Held to maturity, Fair value	0
Total fixed income securities, Held to maturity, Fair value	$ 176,352	$ 195,811

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