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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.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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