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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT - Summary of Notes Payable and Credit Agreement (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instruments [Abstract] |  |
Payments/Long term debt | $ 35,937 | $ 21,495
Less current portion | (672) | (4,899)
Long term portion | 35,265 | 16,596
Credit Facility [Member] |  |
Debt Instruments [Abstract] |  |
Payments/Long term debt | $ 33,000 | $ 16,000
Average effective interest rate | 2.60% | 2.60%
3.25% through 5.50% Notes Payable due in Next Year [Member] |  |
Debt Instruments [Abstract] |  |
Payments/Long term debt | $ 2,937 | $ 5,495
Annual installments | $ 672 |
3.25% through 5.50% Notes Payable due in Next Year [Member] | Minimum [Member] |  |
Debt Instruments [Abstract] |  |
Percentage of interest accrued | 3.25% |
3.25% through 5.50% Notes Payable due in Next Year [Member] | Maximum [Member] |  |
Debt Instruments [Abstract] |  |
Percentage of interest accrued | 5.50% |

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