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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summarized Information on Location and Gross Amount of Derivatives on Consolidated Balance Sheets | The following table summarizes information on the location and the gross amount of the derivatives on the consolidated balance sheets as of December 31, 2022 and 2021:
(Dollars in thousands) |  |  |  | December 31, 2022 |  |  | December 31, 2021 |
Derivatives Not Designated as Hedging Instruments under ASC 815 |  | Balance Sheet Location |  | Notional Amount |  |  | Fair Value |  |  | Notional Amount |  |  | Fair Value |
Interest rate swap agreements |  | Other assets/liabilities |  | $ | — |  |  | $ | — |  |  | $ | 213,022 |  |  | $ | (8,395 | )
Total |  |  |  | $ | — |  |  | $ | — |  |  | $ | 213,022 |  |  | $ | (8,395 | )
Summary of Net Gain (Loss) Included in Consolidated Statements of Operations for Changes in Fair Value of Derivatives and Periodic Net Interest Settlements Under Derivatives | The following table summarizes the net gains (losses) included in the consolidated statements of operations for changes in the fair value of the derivatives and the periodic net interest settlements under the derivatives for the years ended December 31, 2022, 2021, and 2020:
|  | Consolidated Statements of |  | Years Ended December 31, |
(Dollars in thousands) |  | Operations Line |  | 2022 |  |  | 2021 |  |  | 2020 |
Interest rate swap agreements |  | Net realized investment gains (losses) |  | $ | 10,073 |  |  | $ | 2,424 |  |  | $ | (10,691 | )
Futures contracts on bonds |  | Net realized investment gains (losses) |  |  | — |  |  |  | (319 | ) |  |  | (2,576 | )
Futures contracts on equities |  | Net realized investment gains (losses) |  |  | — |  |  |  | — |  |  |  | (8,989 | )
|  |  |  | $ | 10,073 |  |  | $ | 2,105 |  |  | $ | (22,256 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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