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Summary of Significant Accounting Policies (Details 4) (Guaranteed Minimum Death Benefit [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Guaranteed Minimum Death Benefit [Member]
Summary of guaranteed minimum death benefit
GMDB reserve	$ 392	$ 583
Aggregate in-the-money death benefits under the GMDB provision	$ 41,990	$ 53,670
Variable annuity contract value distribution based on GMDB feature:
No guarantee	31.00%	30.00%
Return of premium guarantee	63.00%	64.00%
Guarantee of premium roll-up at an annual rate of 3% or 5%	6.00%	6.00%
Total	100.00%	100.00%

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