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Fair Values of Financial Instruments (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) Basis_Points variable_interest_entities	Dec. 31, 2021 USD ($)
Fair Value Disclosures [Abstract]
FHLB common stock	$ 22,000
Equity method investments, fair value	868,500	$ 520,100
Short-term loans, fair value	177,400	320,000
COLI, fair value	391,200	$ 384,300
Variable interest entity, fair value	$ 56,500
Variable Interest Entity, Primary Beneficiary, Real Estate Investment Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Variable interest entities, number of consolidated variable interest entities | variable_interest_entities	1
Minimum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points	(100)
Fixed index annuities embedded derivative, adjustment due to change in discount rate	$ 457,500
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	$ 180,300
Maximum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, sensitivity, discount rate adjustment (basis points) | Basis_Points	100
Fixed index annuities embedded derivative, adjustment due to change in discount rate	$ (398,700)
Deferred policy scquisition costs and deferred sales inducements, combined balance, adjustment due to change in discount rate	$ (154,500)
Short-Term Debt Securities | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt securities, maturity period	3 months
Short-Term Debt Securities | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term debt securities, maturity period	12 months
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash flow modeling period	10 years
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Residual Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	4.75%
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Minimum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	6.00%
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Residual Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	6.50%
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Maximum | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	7.75%
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Average | Measurement Input, Residual Capitalization Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	5.45%
Significant Unobservable Inputs (Level 3) | Real Estate Investments | Fair Value, Measurements, Recurring | Valuation Technique, Discounted Cash Flow | Average | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investments, measurement input	6.70%

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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