v3.26.1
Financial Instruments and Fair Value Measurements - Carrying Amount and Fair Value (Details) - Nonrecurring - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Carrying Value    
Financial instruments and fair value measurements    
Debt $ 374,846 $ 396,008
Fair Value    
Financial instruments and fair value measurements    
Debt 336,322 355,911
Level 1 | Carrying Value | U.S. Treasury Bills    
Financial instruments and fair value measurements    
Investments held by SPEs 2,062 2,442
Level 1 | Fair Value | U.S. Treasury Bills    
Financial instruments and fair value measurements    
Investments held by SPEs 2,043 2,434
Level 2 | Carrying Value | Fixed-rate debt    
Financial instruments and fair value measurements    
Debt 275,986 280,089
Level 2 | Carrying Value | Variable rate debt    
Financial instruments and fair value measurements    
Debt 98,860 115,919
Level 2 | Fair Value | Fixed-rate debt    
Financial instruments and fair value measurements    
Debt 237,462 239,992
Level 2 | Fair Value | Variable rate debt    
Financial instruments and fair value measurements    
Debt 98,860 115,919
Level 3 | Carrying Value    
Financial instruments and fair value measurements    
Senior Notes held by SPE 178,996 178,821
Level 3 | Carrying Value | Time deposit    
Financial instruments and fair value measurements    
Investments held by SPEs 200,000 200,000
Level 3 | Fair Value    
Financial instruments and fair value measurements    
Senior Notes held by SPE 181,066 183,033
Level 3 | Fair Value | Time deposit    
Financial instruments and fair value measurements    
Investments held by SPEs $ 200,000 $ 200,000