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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
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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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