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Investments (Changes in Net Unrealized Gains/Losses on Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Fixed maturity securities held for investment carried at amortized cost	$ 581	$ 7,478	$ 3,186
Investments carried at fair value	(2,463,693)	1,149,212	508,576
Adjustment for effect on other balance sheet accounts:
Deferred policy acquisition costs and deferred sales inducements	1,318,649	(587,417)	(295,802)
Deferred income tax asset/liability	240,459	(177,162)	(74,471)
Total adjustment for effect on other balance sheet accounts	1,559,108	(764,579)	(370,273)
Change in net unrealized gains/losses on investments carried at fair value	(904,585)	384,633	138,303
Fixed Maturity Securities
Investment Holdings [Line Items]
Investments carried at fair value	(2,463,693)	1,149,691	508,410
Equity Securities
Investment Holdings [Line Items]
Investments carried at fair value	$ 0	$ (479)	$ 166

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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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