Investments (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 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	$ 370,576
Due after 1 year through 5 years, Available for sale, Cost or amortized cost	1,049,481
Due after 5 years through 10 years, Available for sale, Cost or amortized cost	1,244,147
Due after 10 years through 15 years, Available for sale, Cost or amortized cost	831,135
Due after 15 years, Available for sale, Cost or amortized cost	934,740
Securities with contractual maturities, Available for sale, Cost or amortized cost	4,430,079
Mortgage-backed and asset-backed securities, Available for sale, Cost or amortized cost	1,282,811
Available-for-sale Debt Securities, Amortized Cost Basis	5,712,890	5,385,432
Due in 1 year or less, Available for sale, Fair value	374,881
Due after 1 year through 5 years, Available for sale, Fair value	1,097,141
Due after 5 years through 10 years, Available for sale, Fair value	1,352,001
Due after 10 years through 15 years, Available for sale, Fair value	906,673
Due after 15 years, Available for sale, Fair value	1,001,456
Securities with contractual maturities, Available for sale, Fair value	4,732,152
Mortgage-backed and asset-backed securities, Available for sale, Fair value	1,365,714
Available-for-sale Securities, Debt Securities	6,097,866
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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