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Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
states
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
NMOs
states
Dec. 31, 2012
NMOs
Dec. 31, 2011
NMOs
Accounting Policies [Abstract]                      
Number of states in which entity is licensed to sell insurance products 50               50    
National marketing organizations, number of organizations accounting for more than 10% of annuity deposits and insurance premium collections                 1 3 2
Number of days past due, non-accrual status                 90 days    
Administrative fee, group policies                 16.00%    
Provision for annual experience refunds of premiums                 $ 1,100,000 $ 1,100,000 $ 1,800,000
Net realized investment gains (losses) included in net income                 34,300,000 (21,400,000) (52,600,000)
Adjustments to deferred policy acquisition costs, deferred sales inducements and income taxes for net realized investment gains (losses)                 24,100,000 (12,800,000) (34,300,000)
Statement [Line Items]                      
Premiums and other considerations                 45,347,000 76,675,000 118,912,000
Insurance policy benefits and change in future policy benefits                 53,071,000 81,481,000 115,291,000
Interest sensitive and index product benefits                 1,272,867,000 808,479,000 775,097,000
Other operating costs and expenses                 91,915,000 95,495,000 67,559,000
Net income 50,958,000 56,181,000 120,113,000 26,031,000 36,397,000 (7,829,000) 18,759,000 10,471,000 253,283,000 57,798,000 86,248,000
Earnings per common share $ 0.73 $ 0.86 $ 1.87 $ 0.41 $ 0.58 $ (0.13) $ 0.31 $ 0.18 $ 3.86 $ 0.94 $ 1.45
Earnings per common share - assuming dilution $ 0.65 $ 0.75 $ 1.71 $ 0.38 $ 0.55 $ (0.13) $ 0.30 $ 0.16 $ 3.38 $ 0.89 $ 1.37
Accounting Standards Update 2010-26 [Member]
                      
Statement [Line Items]                      
Other operating costs and expenses                     9,800,000
Net income                     (6,200,000)
Earnings per common share                     $ (0.10)
Earnings per common share - assuming dilution                     $ (0.10)
Minimum [Member]
                      
Statement [Line Items]                      
Interest crediting rate, range for fixed index annuities                 1.50%    
Reserve interest assumptions, range                 3.00%    
Maximum [Member]
                      
Statement [Line Items]                      
Interest crediting rate, range for fixed index annuities                 5.00%    
Reserve interest assumptions, range                 5.50%    
Cash and Cash Equivalents [Member]
                      
Statement [Line Items]                      
Investment maturity period (less than)                 3 months    
Repurchase Agreements [Member]
                      
Statement [Line Items]                      
Investment maturity period (less than)                 42 days    
Restatement Adjustment [Member]
                      
Statement [Line Items]                      
Premiums and other considerations                   63,800,000 106,800,000
Insurance policy benefits and change in future policy benefits                   73,400,000 107,400,000
Interest sensitive and index product benefits                   $ (9,600,000) $ (600,000)
National Marketing Organization, Greater than 10%, NMO 1 [Member]
                      
Statement [Line Items]                      
National marketing organizations, percent of annuity deposits and insurance premiums collected individually                 11.00% 12.00% 14.00%
National Marketing Organization, Greater than 10%, NMO 2 [Member]
                      
Statement [Line Items]                      
National marketing organizations, percent of annuity deposits and insurance premiums collected individually                   11.00% 12.00%
National Marketing Organization, Greater than 10%, NMO 3 [Member]
                      
Statement [Line Items]                      
National marketing organizations, percent of annuity deposits and insurance premiums collected individually                   10.00%