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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Derivative Financial Instruments (Details) - Interest rate swap agreement - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jun. 12, 2017
Derivative instruments |  |  |  |
Losses resulted from changes in fair values of the interest rate swap agreement | $ 37 | $ 5 |  |
Line of credit |  |  |  |
Derivative instruments |  |  |  |
Interest rate swap agreement |  |  |  | $ 8,000
Level 2 |  |  |  |
Derivative instruments |  |  |  |
Fair values of interest rate swap agreement | 0 |  | $ 80 |
Prepaid Expenses and Other Current Assets |  |  |  |
Derivative instruments |  |  |  |
Fair values of interest rate swap agreement | $ 0 |  | $ 80 |

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