Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Amortized cost and fair value of fixed maturity securities
Due in 1 year or less, Available for sale, Cost or amortized cost	$ 251,720
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,040,973
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,448,715
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	964,983
Due after 15 years, Available for sale, Cost or amortized cost	952,164
Securities with contractual maturities, Available for sale, Cost or amortized cost	4,658,555
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,160,837
Available-for-sale Debt Securities, Amortized Cost Basis	5,819,392	5,856,432
Due in 1 year or less, Available for sale, Fair value	254,696
Due after 1 year through 5 years, Available for sale, Fair value	1,089,163
Due after 5 years through 10 years, Available for sale, Fair value	1,567,744
Due after 10 years through 15 years, Available for sale, Fair value	1,040,171
Due after 15 years, Available for sale, Fair value	1,013,466
Securities with contractual maturities, Available for sale, Fair value	4,965,240
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,220,216
Available-for-sale Securities, Debt Securities, Fair value	6,185,456
Total fixed income securities, Held to maturity, Amortized cost	0	0
Total fixed income securities, Held to maturity, Fair value	$ 0	$ 0

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