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Organization and Significant Accounting Policies Narrative (Details) (USD $)
 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
NMOs
Dec. 31, 2011
NMOs
Dec. 31, 2010
NMOs
Receipts credited to annuity policyholder account balances                 $ 3,782,275,000 $ 4,784,511,000 $ 4,497,091,000
Return of annuity policyholder account balances                 (1,575,340,000) (1,494,554,000) (1,465,434,000)
National Marketing Organizations, Number of Organizations                 3 2 1
Realized Investment Gains (Losses)                 (21,400,000) (52,600,000) (200,000)
Adjustments to Deferred Policy Acquisition Costs, Deferred Sales Inducements and Income Taxes for Net Realized Gains/Losses                 (12,800,000) (34,300,000) 200,000
National Marketing Organizations Greater Than 10%                     17.00%
Administrative Fee Group Policies                 16.00%    
Provision for Annual Experience Refunds of Premiums                 1,100,000 1,800,000 1,100,000
Other Cost and Expense, Operating                 95,495,000 67,529,000 114,615,000
Net Income (Loss) 36,397,000 (7,829,000) 18,759,000 10,471,000 49,699,000 (13,068,000) 18,274,000 31,343,000 57,798,000 86,248,000 42,933,000
Earnings Per Share, Diluted $ 0.55 $ (0.13) $ 0.30 $ 0.16 $ 0.79 $ (0.22) $ 0.28 $ 0.48 $ 0.89 $ 1.37 $ 0.68
Retained Earnings [Member]
                      
Net Income (Loss)                 57,798,000 86,248,000 42,933,000
National Marketing Organization, Greater than 10%, NMO 1 [Member]
                      
National Marketing Organizations Greater Than 10%                 12.00% 14.00%  
National Marketing Organization, Greater than 10%, NMO 2 [Member]
                      
National Marketing Organizations Greater Than 10%                 11.00% 12.00%  
National Marketing Organization, Greater than 10%, NMO 3 [Member]
                      
National Marketing Organizations Greater Than 10%                 10.00%    
Accounting Standards Update 2010-26 [Member]
                      
Other Cost and Expense, Operating                 9,100,000    
Net Income (Loss)                 5,800,000    
Earnings Per Share, Diluted                 $ 0.09    
Minimum [Member]
                      
Minimum Interest Crediting Range for Fixed Index Annuities                 1.80%    
Minimum Reserve Interest Assumptions                 3.00%    
Maximum [Member]
                      
Maximum Interest Crediting Range for Fixed Index Annuities                 5.25%    
Maximum Reserve Interest Assumptions                 5.50%    
Restatement Adjustment [Member]
                      
Receipts credited to annuity policyholder account balances                   305,600,000 171,600,000
Return of annuity policyholder account balances                   (171,600,000) (171,600,000)
Quantifying Error in Prior Year Financial Statements, Amount                   $ 0 $ 0