v3.26.1
Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Available-for-sale debt securities, at fair value $ 3,471,682 $ 3,265,246  
Fixed-maturity security held to maturity, fair value 1,036,619 1,153,047  
Short-term investments (available-for-sale) 4,950 0  
Equity securities 29,265 26,433  
Separate account assets 2,156,498 2,281,520  
Surplus note 1,073,291 1,175,119  
Separate account liabilities 2,156,498 2,281,520 $ 2,209,287
Fixed-maturity security (held-to-maturity) 1,073,520 1,175,380  
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 3,471,682 3,265,246  
Short-term investments (available-for-sale) 4,950    
Equity securities 29,265 26,433  
Trading securities 32,376 12,801  
Separate account assets 2,156,498 2,281,520  
Separate account liabilities 2,156,498 2,281,520  
Reported 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] 1,073,520    
Policy loans [1] 48,396 47,583  
Surplus note [1],[2] 1,073,291 1,175,119  
Fixed-maturity security (held-to-maturity) [1]   1,175,380  
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],[3] 0 131,418  
Reported Value Measurement [Member] | Level 2 [Member] | Senior Notes [Member]      
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]      
Note payable - Long term [2],[4] 595,716 595,315  
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 3,471,682 3,265,246  
Short-term investments (available-for-sale) 4,950    
Equity securities 29,265 26,433  
Trading securities 32,376 12,801  
Separate account assets 2,156,498 2,281,520  
Separate account liabilities 2,156,498 2,281,520  
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] 1,036,619 1,153,047  
Policy loans [1] 48,396 47,583  
Surplus note [1],[2] 1,035,912 1,150,995  
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],[3] 0 131,418  
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]      
Note payable - Long term [2],[4] $ 539,627 $ 543,461  
[1] Classified as a Level 3 fair value measurement.
[2] Carrying value amounts shown are net of unamortized issuance costs.
[3] On January 1, 2026, we terminated a coinsurance agreement (the “10% Coinsurance Agreement”) (that was entered into in connection with our 2010 initial public offering) with Prime Reinsurance Company (“Prime Re”), an affiliate of Citigroup, Inc. The 10% Coinsurance Agreement ceded 10% of our U.S. (except New York) term life insurance business in force at year-end 2009 subject to an experience refund provision. As the 10% Coinsurance Agreement included an experience refund provision, it did not satisfy U.S. GAAP risk transfer rules. As a result, we accounted for this contract using deposit method accounting and recognized a deposit asset in other assets on our consolidated balance sheets for assets backing the reserves of the policies subject to the agreement. The deposit asset held in support of this agreement was $131.4 million at December 31, 2025. We made contributions to the deposit asset during the life of the agreement to fulfill our responsibility of funding the reserves. During 2025, the cumulative experience refund provision was settled by reductions in the deposit asset over the normal course of the 10% Coinsurance Agreement. Upon termination of the 10% Coinsurance Agreement, the Company received cash equal to the carrying value of the deposit asset and thus did not recognize any gain or loss. Prior to the termination of the 10% Coinsurance Agreement, the market return on the deposit asset was reflected in net investment income as disclosed in Note 4 (Investments).
[4] Classified as a Level 2 fair value measurement.