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Other Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 144 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2031 | Dec. 31, 2022 | Dec. 31, 2020
Schedule of Other Assets [Line Items] |  |  |  |  |  |  |
Prepaid expenses, net of current portion | $ 17,321 |  | $ 17,321 |  |  | $ 18,192 |
Capital contributions | $ 162 | $ 0 | $ 314 | $ 48 |  |  |
Minimum | Limited Partnerships |  |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage | 3.00% |  | 3.00% |  |  |  |
Maximum | Limited Partnerships |  |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |  |
Ownership percentage | 5.00% |  | 5.00% |  |  |  |
Forecast |  |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |  |
Capital contributions |  |  |  |  | $ 2,400 |  |
Jack Welch Management Institute |  |  |  |  |  |  |
Schedule of Other Assets [Line Items] |  |  |  |  |  |  |
Commitment for future services under the perpetual license agreement |  |  |  |  |  |  | $ 25,300
Prepaid expenses, net of current portion | $ 16,500 |  | $ 16,500 |  |  | $ 17,700 |
Prepaid expense, amortization period |  |  | 15 years |  |  |  |

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