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CASH FLOW INFORMATION - Stock-Based Compensation (Details) - 2015 EIP Plan - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
May 15, 2018 | Feb. 27, 2018 | May 17, 2017 | Mar. 23, 2017 | Jun. 30, 2018
Restricted Stock Units |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |
Granted (in shares) |  | 37,346 |  |  | 51,704
Aggregate fair value |  | $ 512 |  |  |
Restricted Stock Units | John C. Wobensmith |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |
Granted (in shares) |  |  |  | 292,398 |
Aggregate fair value |  |  |  | $ 3,254 |
Restricted Stock Units | Directors |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |
Granted (in shares) | 14,268 |  | 25,197 |  |
Aggregate fair value | $ 255 |  | $ 255 |  |
Stock Options |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |
Options to purchase (in shares) |  | 122,608 |  |  | 122,608
Exercise price |  | $ 13.69 |  |  | $ 13.69
Aggregate fair value |  | $ 926 |  |  |
Stock Options | John C. Wobensmith |  |  |  |  |
Non-cash investing and financing activities |  |  |  |  |
Options to purchase (in shares) |  |  |  | 133,000 |
Exercise price |  |  |  | $ 11.13 |
Aggregate fair value |  |  |  | $ 853 |

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