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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments [Abstract]
Fixed maturity securities available for sale carried at fair value	$ (1,661,361)	$ (2,862,408)
Adjustment for effect on other balance sheet accounts:
Deferred policy acquisition costs, deferred sales inducements and policy benefit reserves	777,441	1,397,198
Deferred income tax asset/liability	185,623	307,695
Total adjustment for effect on other balance sheet accounts	963,064	1,704,893
Change in net unrealized gains/losses on investments carried at fair value	$ (698,297)	$ (1,157,515)

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Adjustments for Assumed Changes in Amortization of Deferred Policy Acquisition Costs. Deferred Sales Inducements and Policy Benefit Reserves Due to Net Unrealized Gains and Losses on Available for Sale Fixed Maturity and Equity Securities.

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Represents the aggregate of the adjustments for the effect on other balance sheet accounts related to the pretax change in net unrealized holding gain (loss) on available-for-sale securities that has been included in accumulated other comprehensive income, a separate component of shareholders' equity, during the period.

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 220
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-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580

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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 220
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-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580

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