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Fair Value of Financial Instruments - Investment in BFG Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Investments in and Advances to Affiliates, at Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 4,800 | $ 5,900
Distributions from BFG |  |  | (335) | (327)
Change in fair value of BFG | $ 120 | $ (575) | 35 | (973)
Ending balance | $ 4,500 | $ 4,600 | $ 4,500 | $ 4,600

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