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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT - Summary of Notes Payable and Credit Agreement (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instruments [Abstract] |  |
Payments/Long term debt, Total | $ 59,428 | $ 60,772
Less current portion | (4,769) | (4,044)
Long term portion | 54,659 | 56,728
Credit Facility [Member] |  |
Debt Instruments [Abstract] |  |
Payments/Long term debt, Total | $ 54,000 | 54,000
Average effective interest rate | 4.00% |
3.25% through 4.75% Notes Payable due in Next Year [Member] |  |
Debt Instruments [Abstract] |  |
Payments/Long term debt, Total | $ 5,428 | $ 6,772
Annual installments | $ 4,769 |
3.25% through 4.75% Notes Payable due in Next Year [Member] | Minimum [Member] |  |
Debt Instruments [Abstract] |  |
Percentage of interest accrued | 3.25% |
3.25% through 4.75% Notes Payable due in Next Year [Member] | Maximum [Member] |  |
Debt Instruments [Abstract] |  |
Percentage of interest accrued | 5.00% |

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