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Deposit Asset on Reinsurance - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2019 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Effects of Reinsurance [Line Items] |  |  |  |
Reinsurance block of in-force fixed and variable annuity business |  | $ 2,900,000 | $ 2,900,000 |
Fixed annuity reserves reinsured on a coinsurance basis | $ 2,200,000 |  |  |
Deposit asset on reinsurance | 2,300,000 | 2,346,166 |  | $ 0
Investment gain realized, net of tax | 106,900 |  |  |
Separate account asset |  | 2,490,469 |  | 2,001,128
Separate account liability |  | $ 2,490,469 |  | $ 2,001,128
Reinsurance Deposit Receivable | Third Party Reinsurer Risk |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Concentration risk, percent |  | 50.00% |  |
Reinsurance Contract Modified Coinsurance Basis |  |  |  |
Effects of Reinsurance [Line Items] |  |  |  |
Separate account asset | $ 700,000 |  |  |
Separate account liability |  | $ 700,000 |  |
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://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 2: 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=118260190&loc=d3e13531-108611 Reference 3: 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=118260190&loc=d3e13537-108611 Reference 4: 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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