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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Movement in Deferred Sales Inducements [Roll Forward] |  |  |
Balance at beginning of year | $ 2,516,721 | $ 2,001,892 | $ 2,208,218
Costs deferred during the year | 177,941 | 179,465 | 216,172
Amortization: Amortization | (193,292) | (243,666) | (210,886)
Amortization: Impact of unlocking | 104,707 | 21,465 | 34,274
Effect of net unrealized gains/losses | (639,354) | 557,565 | (245,886)
Balance at end of year | $ 1,966,723 | $ 2,516,721 | $ 2,001,892

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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 http://asc.fasb.org/extlink&oid=117419109&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 http://asc.fasb.org/extlink&oid=117419109&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 http://asc.fasb.org/extlink&oid=117419843&loc=SL117420844-207641 + Details
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- Definition Amount of deferred sale inducement cost capitalized on contract remaining in force. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 2B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117419109&loc=SL117422543-158416 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6481654&loc=d3e11214-158414 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117419109&loc=d3e11332-158416 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=117419843&loc=SL117420844-207641 + Details
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