Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 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	$ 259,072
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,086,817
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,093,709
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	753,856
Due after 15 years, Available for sale, Cost or amortized cost	876,352
Securities with fixed maturities, Available for sale, Cost or amortized cost	4,069,806
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,315,626
Available-for-sale Debt Securities, Amortized Cost Basis	5,385,432	4,864,806
Due in 1 year or less, Available for sale, Fair value	264,361
Due after 1 year through 5 years, Available for sale, Fair value	1,133,474
Due after 5 years through 10 years, Available for sale, Fair value	1,189,777
Due after 10 years through 15 years, Available for sale, Fair value	818,232
Due after 15 years, Available for sale, Fair value	922,034
Securities with fixed maturities, Available for sale, Fair value	4,327,878
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,390,956
Due in 1 year or less, Held to maturity, Amortized cost	63,127
Due after 1 year through 5 years, Held to maturity, Amortized cost	97,137
Due after 5 years through 10 years, Held to maturity, Amortized cost	838
Securities with fixed maturities, Held to maturity, Amortized cost	161,102
Total fixed income securities, Held to maturity, Amortized cost	161,102	193,668
Due in 1 year or less, Held to maturity, Fair value	63,340
Due after 1 year through 5 years, Held to maturity, Fair value	98,874
Due after 5 years through 10 years, Held to maturity, Fair value	922
Securities with fixed maturities, Held to maturity, Fair value	163,136
Total fixed income securities, Held to maturity, Fair value	$ 163,136	$ 195,811

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