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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Basis_Points | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Basis_Points | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Level 1 to Level 2 transfers, amount | $ 0 |  | $ 0 |  | $ 0
Liabilities, Level 1 to Level 2 transfers, amount | 0 |  | 0 |  | 0
Assets, Level 2 to Level 1 transfers, amount | 0 |  | 0 |  | 0
Liabilities, Level 2 to Level 1 transfers, amount | 0 |  | 0 |  | 0
Assets, transfers into Level 3, amount | 0 | $ 0 | 0 | $ 0 |
Liabilities, transfers into Level 3, amount | 0 | 0 | 0 | 0 |
Assets, transfers out of Level 3, amount | 0 | 0 | 0 | 0 |
Liabilities, transfers out of Level 3, amount | 0 | $ 0 | 0 | $ 0 |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 4,936,037 |  | $ 4,936,037 |  | 4,858,289
Fair Value, Sensitivity, Increase in Discount Rate by 10 Percent [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | $ (523,000) |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | $ (324,100) |  |
Fair Value, Sensitivity, Decrease in Discount Rate by 10 Percent [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points | 100 |  | 100 |  |
Fixed index annuities embedded derivative, adjustment due to change in discount rate |  |  | $ 581,000 |  |
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate |  |  | 336,700 |  |
Fixed Index Annuities - Embedded Derivatives [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Coinsurance ceded, fixed index annuities embedded derivatives | $ 547,400 |  | $ 547,400 |  | $ 539,700

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- Definition Corresponding amount of change in the combined balance of deferred policy acquistion costs and deferred sales inducements due to a change in the discount rate utilized to determine the fair value of embedded derivatives. + References No definition available. + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489 Reference 3: 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.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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