Derivative Instruments (Details 5) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Credit Exposure of Derivative Contracts
Estimated fair value of derivatives in net asset (liability) position	$ (10,741)	$ (29,801)
Cash provided as collateral	0	0
Securities provided as collateral	(60,337)	(48,223)
Cash received as collateral	(18,310)	(10,300)
Securities received as collateral	(30,253)	(1,781)
Net credit exposure	1,033	6,341
Margin account related to exchange-traded futures	$ 11,379	$ 16,285

Changes in estimated fair value related to embedded derivatives Abstract.

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- Definition

The aggregate estimated fair value asset (liability) of derivative instruments that are subject to or not subject to credit-contingent provisions at the end of the reporting period.

+ Details

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- Definition

The aggregate cash amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net liability position at the end of the reporting period. The estimated fair value amounts are included in cash.

+ Details

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- Definition

The aggregate estimated fair value amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net liability position at the end of the reporting period. The estimated fair value amounts are included in other invested assets.

+ Details

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- Definition

The aggregate cash amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net asset position at the end of the reporting period. The estimated fair value amounts are included in cash.

+ Details

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- Definition

The aggregate estimated fair value amounts of collateral provided for derivative instruments that are subject to or not subject to credit-contingent provisions that are in a net asset position at the end of the reporting period. The estimated fair value amounts are included in fixed maturity securities.

+ Details

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- Definition

Represents the entity's margin account related to exchange-traded futures.

+ Details

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- Definition

Represents the entity's net credit exposure related to derivative contracts.

+ Details

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