Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Amortized cost and fair value of fixed maturity securities
Due in 1 year or less, Available for sale, Cost or amortized cost	$ 300,842
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,101,203
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,411,731
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	936,809
Due after 15 years, Available for sale, Cost or amortized cost	957,573
Securities with contractual maturities, Available for sale, Cost or amortized cost	4,708,158
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,148,274
Available-for-sale Debt Securities, Amortized Cost Basis	5,856,432	5,385,432
Due in 1 year or less, Available for sale, Fair value	305,382
Due after 1 year through 5 years, Available for sale, Fair value	1,157,575
Due after 5 years through 10 years, Available for sale, Fair value	1,541,532
Due after 10 years through 15 years, Available for sale, Fair value	1,023,796
Due after 15 years, Available for sale, Fair value	1,031,045
Securities with contractual maturities, Available for sale, Fair value	5,059,330
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,222,451
Available-for-sale Securities, Debt Securities, Fair value	6,281,781
Total fixed income securities, Held to maturity, Amortized cost	0	161,102
Total fixed income securities, Held to maturity, Fair value	$ 0	$ 163,136

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