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Investments Fixed Maturity Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis	$ 100,860
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis	737,142
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis	5,706,584
Available-for-sale Securities, Debt Maturities, after Ten Years through Twenty Years, Amortized Cost Basis	5,804,473
Available-for-sale Securities, Debt Maturities, after Twenty Years, Amortized Cost	6,953,594
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost	19,302,653
Available-for-sale Debt Securities, Amortized Cost Basis	23,513,179
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value	105,574
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value	833,797
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value	6,093,251
Available-for-sale Securities, Debt Maturities, after Ten Years Through Twenty Years, Fair Value	6,322,926
Available-for-sale Securities, Debt Maturities, after Twenty Years, Fair Value	7,815,035
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Fair Value	21,170,583
Available-for-sale Securities, Debt Securities	25,609,218	24,172,136
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	76,129
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Net Carrying Amount	76,129
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	76,129
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	62,173
Held-to-maturity Securities, Debt Maturities, Single Maturity Date, Fair Value	62,173
Held-to-maturity Securities, Debt Maturities, Fair Value	62,173
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	2,488,435
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	2,668,454
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	742,965
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	748,601
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	979,126
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]
Available-for-sale Securities, without Single Maturity Date, Fair Value	1,021,580
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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