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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Liability for Lifetime Income Benefit Riders (Deferred Sales Inducements) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Movement in Deferred Sales Inducements [Roll Forward] |  |  |
Balance at beginning of year | $ 1,546,073 | $ 1,448,375 | $ 2,042,060
Costs deferred during the year | 107,691 | 95,160 | 93,610
Amortization: Amortization | (362,866) | (197,799) | (10,063)
Amortization: Impact of unlocking | (45,682) | 45,107 | (428,101)
Effect of net unrealized gains/losses | 1,348,134 | 155,230 | (249,131)
Balance at end of year | $ 2,593,350 | $ 1,546,073 | $ 1,448,375

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- Definition Amount of amortization expense (reversal of amortization expense) for deferred sales inducement cost from assumption change. + References No definition available. + Details
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- Definition Amount of unrealized investment gain (loss) which decreases (increases) deferred sales inducement cost. + References No definition available. + Details
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- Definition Amount of deferred sale inducement cost capitalized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2B -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124505477&loc=SL117422543-158416 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124505477&loc=d3e11332-158416 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 + Details
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