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Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value $ 2,554,465 $ 2,702,567
Fixed-maturity security held to maturity, fair value 1,378,744 1,551,113
Equity securities 35,877 42,551
Separate account assets 2,358,987 2,799,992
Surplus note 1,415,457 1,378,585
Separate account liabilities 2,358,987 2,799,992
Fixed-maturity security (held-to-maturity) 1,415,940 1,379,100
Reported Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value 2,554,465 2,702,567
Short-term investments (available-for-sale) 3,311 85,243
Equity securities 35,877 42,551
Trading securities 8,976 24,355
Separate account assets 2,358,987 2,799,992
Separate account liabilities 2,358,987 2,799,992
Reported Value Measurement [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Policy loans [1] 33,069 30,612
Surplus note [1],[2] 1,415,457 1,378,585
Fixed-maturity security (held-to-maturity) [1] 1,415,940 1,379,100
Reported Value Measurement [Member] | Level 3 [Member] | Deposits [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Deposit asset underlying 10% coinsurance agreement [1] 227,958 231,368
Reported Value Measurement [Member] | Level 2 [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Notes payable - Long term [2],[3] 592,504 592,102
Estimate of Fair Value Measurement [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale debt securities, at fair value 2,554,465 2,702,567
Short-term investments (available-for-sale) 3,311 85,243
Equity securities 35,877 42,551
Trading securities 8,976 24,355
Separate account assets 2,358,987 2,799,992
Separate account liabilities 2,358,987 2,799,992
Estimate of Fair Value Measurement [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fixed-maturity security held to maturity, fair value [1] 1,378,744 1,551,113
Policy loans [1] 33,069 30,612
Surplus note [1],[2] 1,372,732 1,545,854
Estimate of Fair Value Measurement [Member] | Level 3 [Member] | Deposits [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Deposit asset underlying 10% coinsurance agreement [1] 227,958 231,368
Estimate of Fair Value Measurement [Member] | Level 2 [Member] | Senior Notes [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Notes payable - Long term [2],[3] $ 505,791 $ 605,667
[1] Classified as a Level 3 fair value measurement.
[2] Carrying value amounts shown are net of issuance costs
[3] Classified as a Level 2 fair value measurement.