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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Shares available for grant |  | 678,951 |  |
Closing stock price of common stock |  | $ 35.02 |  |
Performance Shares [Member] |  |  |  |
Unrecognized compensation cost |  | $ 1,700 |  |
Reversal of previously recorded amounts | $ 592 |  |  |
Employee Stock Option [Member] |  |  |  |
Option term |  | 10 years |  |
Vesting term |  | 5 years |  |
Unrecognized compensation cost |  | $ 43,600 |  |
Weighted average period, unrecognized compensation expected to be recognized (in years) |  | 6 months 14 days |  |
Total compensation cost |  | $ 6 | $ 56 | $ 219
Restricted stock [Member] |  |  |  |
Unrecognized compensation cost |  | $ 737 |  |
Weighted average period, unrecognized compensation expected to be recognized (in years) |  | 1 year 2 months 12 days |  |
Total compensation cost |  | $ 3,500 | $ 2,800 | $ 1,500
Restricted stock [Member] | Share-based Compensation Award, Tranche Two [Member] |  |  |  |
Vesting term |  | 5 years |  |
Restricted stock [Member] | Share-based Compensation Award, Tranche One [Member] |  |  |  |
Vesting term |  | 3 years |  |

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