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Quarterly Financial Information Schedule of Error Corrections and Prior Period Adjustment Restatement (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Income $ 36,397 $ (7,829) $ 18,759 $ 10,471 $ 49,699 $ (13,068) $ 18,274 $ 31,343 $ 57,798 $ 86,248 $ 42,933
Policy Benefit Reserves, Single Premium Immediate Annuities [Member]
                      
Net Income               $ 2,700