Investments Fixed Maturity Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 41,968
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	623,552
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	3,868,878
Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis	5,294,593
Available-for-sale Securities, Debt Maturities, after Twenty Years, Amortized Cost	6,944,881
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost	16,773,872
Available-for-sale Debt Securities, Amortized Cost Basis	20,136,014	16,980,279
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	43,181
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	700,154
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	4,262,988
Available-for-sale Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value	5,820,676
Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value	8,050,229
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value	18,877,228
Available-for-sale Securities, Debt Securities	22,410,492	18,464,109
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Net Carrying Amount	76,048
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Net Carrying Amount	76,048
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	76,048
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, within One Year, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after One Through Five Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value	0
Held-to-maturity Securities, Debt Maturities, after Twenty Years, Fair Value	63,759
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	63,759
Held-to-maturity Securities, Debt Maturities, Fair Value	63,759
Residential Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	2,433,080
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	2,565,959
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	0
Commercial Mortgage Backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	78,682
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	78,912
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	0
Asset-backed Securities [Member]
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, without Single Maturity Date, Amortized Cost	850,380
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	888,393
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	0
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	$ 0

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