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Related Party Transactions and Investments in Non-Consolidated Entities - Allowance for credit losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |
Beginning allowance for credit losses | $ (4,237,000) |  | $ (4,237,000) |  |
Additional increases to the allowance for credit losses |  |  |  | $ (1,857,000) | $ 4,200,000
Reductions to the allowance for credit losses | $ 4,200,000 | $ 0 | $ 4,237,000 |  |
Ending allowance for credit losses |  |  |  | $ 1,857,000 | $ 4,237,000

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