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Deposit Asset on Reinsurance - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance block of in-force fixed and variable annuity business |  | $ 2,900,000 |  |
Fixed annuity reserves reinsured on a coinsurance basis | $ 2,200,000 |  |  |
Deposit asset on reinsurance | 2,300,000 |  | $ 2,402,539 | $ 2,346,166
Investment gain realized, net of tax | $ 106,900 |  |  |
Separate account asset |  |  | 2,488,528 | 2,490,469
Separate account liability |  |  | 2,488,528 | $ 2,490,469
Reinsurance Contract Modified Coinsurance Basis |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Separate account asset |  |  | 700,000 |
Separate account liability |  |  | $ 700,000 |
Reinsurance Deposit Receivable | Third Party Reinsurer Risk |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Concentration risk, percent |  |  | 50.00% |
Minimum |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Minimum crediting rating |  | 4.50% |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition Amount before valuation allowance recoverable 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 No definition available. + Details
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