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Significant Accounting Policies (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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% |

X
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