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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Investments [Abstract]
Fixed maturity securities held for investment carried at amortized cost	$ 0	$ 2,947	$ 0	$ (5,519)
Fixed maturity securities available for sale carried at fair value	990,481	(311,954)	3,891,291	(2,122,555)
Adjustment for effect on other balance sheet accounts:
Deferred policy acquisition costs and deferred sales inducements	(245,044)	172,566	(1,750,390)	1,132,853
Deferred income tax asset/liability	(155,992)	29,270	(449,040)	207,837
Total adjustment for effect on other balance sheet accounts	(401,036)	201,836	(2,199,430)	1,340,690
Change in net unrealized gains/losses on investments carried at fair value	$ 589,445	$ (110,118)	$ 1,691,861	$ (781,865)

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

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Change in Net Unrealized Gain or Loss, Fixed Maturity Securities, Held for Investment

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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.

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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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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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