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Fair Value of Financial Instruments - Investment in BFG Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning balance     $ 4,800 $ 5,900
Change in fair value of BFG $ (500) $ (100) (800) (1,400)
Ending balance $ 4,000 $ 4,500 $ 4,000 $ 4,500