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Notes Payable and Other Noncurrent Liabilities - Current and Noncurrent Portions of Notes Payable (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Notes Payable and Other Noncurrent Liabilities |  |
Less: Current portion | $ 82,915 | $ 33,144
Notes payable, less current portion |  | 74,630
Amended and restated credit agreement |  |
Notes Payable and Other Noncurrent Liabilities |  |
Notes payable including current portion | 82,915 | 107,774
Less: Current portion | 82,915 | 33,144
Notes payable, less current portion |  | 74,630
Amended and restated credit agreement | Term loan facility |  |
Notes Payable and Other Noncurrent Liabilities |  |
Quarterly payment of notes payable | 8,368 |
Notes payable including current portion | $ 82,915 | $ 107,774
Amended and restated credit agreement | Term loan facility | 30-Day LIBOR |  |
Notes Payable and Other Noncurrent Liabilities |  |
Margin on variable interest rate | 2.00% | 2.00%
Interest rate of notes payable | 2.09% |

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