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CASH FLOW INFORMATION - Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 17, 2017 | Mar. 23, 2017 | Oct. 13, 2016 | May 18, 2016 | Feb. 17, 2016 | Jul. 29, 2015 | Jul. 17, 2015 | Jul. 13, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Stock | Peter C. Georgiopoulos, Chairman of Board |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 68,581 |  |  |  |  |  |  |  |
Vested (in shares) |  |  | 68,581 |  |  |  |  |  |  |  |
2015 EIP Plan | Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 317,595 | 66,666 | 7,440
Vested (in shares) |  |  |  |  |  |  |  |  | 164,132 | 5,821 | 1,619
2015 EIP Plan | Restricted Stock Units | John C. Wobensmith |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 292,398 |  |  |  |  |  |  |  |  |
Aggregate fair value |  | $ 3,254 |  |  |  |  |  |  |  |  |
2015 EIP Plan | Restricted Stock Units | Directors |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 25,197 |  |  | 66,666 |  | 5,821 |  | 1,619 |  |  |
Aggregate fair value | $ 255 |  |  | $ 340 |  | $ 416 |  | $ 113 |  |  |
Vested (in shares) |  |  |  | 3,493 | 2,328 |  | 1,619 |  |  |  |
2015 EIP Plan | Stock Option | John C. Wobensmith |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Options to purchase (in shares) |  | 133,000 |  |  |  |  |  |  |  |  |
Exercise price |  | $ 11.13 |  |  |  |  |  |  |  |  |
Aggregate fair value |  | $ 853 |  |  |  |  |  |  |  |  |
2015 EIP Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 61,224 |
Vested (in shares) |  |  |  |  |  |  |  |  | 6,803 | 47,619 |
2015 EIP Plan | Restricted Stock | Peter C. Georgiopoulos, Chairman of Board |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 40,816 |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  | 40,816 |
2015 EIP Plan | Restricted Stock | John C. Wobensmith |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 20,408 |  |  |  |  |  |
2015 EIP Plan | Restricted Stock | Executive Officers |  |  |  |  |  |  |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |  |  |  |  |  |  |
Aggregate fair value |  |  |  |  | $ 318 |  |  |  |  |  |

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