Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 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	$ 335,455
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,063,361
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,331,492
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	869,485
Due after 15 years, Available for sale, Cost or amortized cost	931,342
Securities with contractual maturities, Available for sale, Cost or amortized cost	4,531,135
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,316,043
Available-for-sale Debt Securities, Amortized Cost Basis	5,847,178	5,385,432
Due in 1 year or less, Available for sale, Fair value	340,330
Due after 1 year through 5 years, Available for sale, Fair value	1,121,440
Due after 5 years through 10 years, Available for sale, Fair value	1,462,880
Due after 10 years through 15 years, Available for sale, Fair value	961,876
Due after 15 years, Available for sale, Fair value	1,015,473
Securities with contractual maturities, Available for sale, Fair value	4,901,999
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,413,366
Available-for-sale Securities, Debt Securities	6,315,365
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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