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Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) states | Dec. 31, 2016 | Dec. 31, 2015
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 |  |
Minimum [Member] |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  | 1.00% | 1.00% | 1.00%
Maximum [Member] |  |  |  |
Interest crediting rate, range for fixed index annuities and other deferred annuity products |  | 3.30% | 3.30% | 3.30%
Maximum [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Investment maturity period (less than) |  | 3 months |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New accounting pronouncement, effect of adoption, quantification |  | $ 2.8 |  |
Forecast [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |
New accounting pronouncement, effect of adoption, quantification | $ 128.0 |  |  |

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- Definition Rate of interest credited to policyholder deposits. + 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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