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Significant Accounting Policies (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) states NMOs | Dec. 31, 2015 USD ($) NMOs | Dec. 31, 2014 USD ($) NMOs
Accounting Policies [Abstract] |  |  |
Number of states in which entity is licensed to sell insurance products | states | 50 |  |
Number of days past due, non-accrual status | 90 days |  |
Provision for annual experience refunds of premiums | $ | $ 1.5 | $ 1.5 | $ 1.7
National marketing organizations, number of organizations accounting for more than 10% of annuity deposits and insurance premium collections | NMOs | 2 | 1 | 2
Minimum [Member] |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products | 1.00% | 1.00% | 1.00%
Reserve interest assumptions, range | 3.00% |  |
Maximum [Member] |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products | 3.30% | 3.30% | 3.30%
Reserve interest assumptions, range | 5.50% |  |
Cash and Cash Equivalents [Member] |  |  |
Investment maturity period (less than) | 3 months |  |
Repurchase Agreements [Member] |  |  |
Investment maturity period (less than) | 42 days |  |
National Marketing Organization, Greater than 10%, NMO 1 [Member] |  |  |
National marketing organizations, percent of annuity deposits and insurance premiums collected individually | 19.00% | 24.00% | 10.00%
National Marketing Organization, Greater than 10%, NMO 2 [Member] |  |  |
National marketing organizations, percent of annuity deposits and insurance premiums collected individually | 10.00% |  | 10.00%

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- Definition Provision for annual experience refunds of permiums equal to net premiums less a 16% administrative fee and less claims incurred. + References No definition available. + Details
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- Definition Rate of interest used to calculate the liability for future policy benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439 + Details
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