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Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) states	Dec. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of states in which entity is licensed to sell insurance products | states	50
Mortgage loans on real estate, allowance for credit losses	$ 36,972	$ 24,024		$ 31,029
Coinsurance deposits, allowance for credit losses	8,737	2,264
Retained earnings	3,914,124	2,767,422
Estimated impact to stockholders' equity at January 1, 2021	$ 3,190,456	$ 6,323,127		$ 6,348,988		$ 4,426,522
Minimum
Number of days past due, non-accrual status	90 days
Interest crediting rate, range for fixed index annuities and other deferred annuity products	1.45%	1.45%		1.45%
Minimum | Fixed Maturity Securities, Available For Sale
Investment maturity period	1 year
Minimum | Other Invested Assets - COLI, Equity Securities, Short-Term Debt Securities
Investment maturity period	3 months
Maximum
Interest crediting rate, range for fixed index annuities and other deferred annuity products	2.65%	2.65%		2.65%
Maximum | Other Invested Assets - COLI, Equity Securities, Short-Term Debt Securities
Investment maturity period	12 months
Maximum | Other Invested Assets - Short-Term Loans and Collateral Loans
Investment maturity period	1 year
Maximum | Cash and Cash Equivalents
Investment maturity period	3 months
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
Mortgage loans on real estate, allowance for credit losses					$ 8,600
Coinsurance deposits, allowance for credit losses					3,200
Retained earnings					$ (9,300)
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Minimum | Pro Forma
Estimated impact to stockholders' equity at January 1, 2021			$ 1,500,000
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment | Maximum | Pro Forma
Retained earnings			100,000
Estimated impact to stockholders' equity at January 1, 2021			$ 2,000,000

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