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STOCKHOLDERS' EQUITY (Treasury Stock) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Treasury Stock |  |  |
Aggregate cost of shares repurchased during the period | $ 201 | $ 6,019 |
Stock Repurchase Program |  |  |
Treasury Stock |  |  |
Amount available for repurchase | $ 31,500 |  | $ 31,700
Number of shares repurchased during the period | 5,882 |  |
Aggregate cost of shares repurchased during the period | $ 200 |  |

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