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STOCKHOLDERS' EQUITY (Treasury Stock) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 22, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2015
Treasury Stock |  |  |  |  |
Aggregate cost of shares repurchased during the period |  | $ 9,404 | $ 6,019 | $ 9,510 |
Treasury stock (in shares) |  | 3,097,634 | 2,851,578 |  |
Stock Repurchase Program |  |  |  |  |
Treasury Stock |  |  |  |  |
Amount of stock repurchases authorized |  |  |  |  | $ 50,000
Number of shares repurchased during the period |  | 246,056 |  |  |
Aggregate cost of shares repurchased during the period |  | $ 9,400 |  |  |
Amount available for repurchase |  | $ 22,300 |  |  |
Stock Repurchase Program | Subsequent Event |  |  |  |  |
Treasury Stock |  |  |  |  |
Number of shares repurchased during the period | 29,385 |  |  |  |
Aggregate cost of shares repurchased during the period | $ 1,100 |  |  |  |
Amount available for repurchase | $ 21,200 |  |  |  |

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