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Financial Instruments - Summary of Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Debt Securities, Available for Sale [Roll Forward]    
Fair value at beginning of period $ 43,485 $ 38,670
Purchases 14,122 19,771
Redemptions (3,310) (5,630)
Maturities (15,155) (6,770)
Change in bond premium (1,099) (645)
Fair market value adjustment 1,416 (1,911)
Fair value at end of period $ 39,459 $ 43,485