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SUBSEQUENT EVENTS (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 27, 2018 item $ / shares shares | Mar. 31, 2018 USD ($) | Dec. 31, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares
2015 EIP Plan | Restricted Stock Units |  |  |  |  |
Subsequent Events |  |  |  |  |
Granted (in shares) |  |  | 317,595 | 66,666 | 7,440
2015 EIP Plan | Stock Options |  |  |  |  |
Subsequent Events |  |  |  |  |
Options to purchase (in shares) |  |  | 133,000 |  |
Subsequent Event |  |  |  |  |
Subsequent Events |  |  |  |  |
Number of vessels disposed off | item | 9 |  |  |  |
Subsequent Event | 2015 EIP Plan | RSUs and Stock Options |  |  |  |  |
Subsequent Events |  |  |  |  |
Vesting percentage of awards | 33.00% |  |  |  |
Vesting period of awards | 3 years |  |  |  |
Subsequent Event | 2015 EIP Plan | Restricted Stock Units |  |  |  |  |
Subsequent Events |  |  |  |  |
Granted (in shares) | 37,436 |  |  |  |
Subsequent Event | 2015 EIP Plan | Stock Options |  |  |  |  |
Subsequent Events |  |  |  |  |
Options to purchase (in shares) | 122,608 |  |  |  |
Exercise price (in dollars per share) | $ / shares | $ 13.69 |  |  |  |
Subsequent Event | Forecast |  |  |  |  |
Subsequent Events |  |  |  |  |
Impairment loss | $ |  | $ 56,400 |  |  |

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