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5. Changes in Guaranteed Liability Balances (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Variable Annutity GMDB
   
Liability balance, beginning of the period $ 4,892 $ 4,570
Incurred (585) (1,608)
Paid 665 1,930
Liability balance, end of the period 4,972 4,892
Variable Annutity GMIB
   
Liability balance, beginning of the period 17,200 17,457
Incurred 3,553 (257)
Paid 0 0
Liability balance, end of the period $ 20,753 $ 17,200