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Investments Schedule of Credit Quality of Fixed Maturity Security Portfolio by NAIC Designation (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investment Holdings [Line Items]
Percentage of Investment Grade Fixed Maturity Securities, at Fair Value	98.00%	98.00%
Fair Value, Fixed Maturity Securities [Member]
Investment Holdings [Line Items]
NAIC 1 Designation	$ 16,049,276	$ 15,250,560
NAIC 2 Designation	9,028,631	8,533,121
NAIC 3 Designation	457,918	387,222
NAIC 4 Designation	69,502	56,151
NAIC 5 Designation	0	0
NAIC 6 Designation	1,565	6,603
Fixed Maturity Securities	25,606,892	24,233,657
Amortized Cost Basis [Member]
Investment Holdings [Line Items]
NAIC 1 Designation	15,440,564	13,737,381
NAIC 2 Designation	8,878,184	7,838,186
NAIC 3 Designation	475,652	398,294
NAIC 4 Designation	68,807	53,879
NAIC 5 Designation	0	0
NAIC 6 Designation	2,050	5,375
Fixed Maturity Securities	$ 24,865,257	$ 22,033,115

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Investment securities with a single maturity date.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 1.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 2.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 3.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 4.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 5.

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The National Association of Insurance Commissioners (NAIC) assigns designations to fixed maturity securities from Class 1 (highest quaility) to class 6 (lowest quality). These securities represent Class 6.

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Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

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