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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) | 1,559,012 | 1,559,012 | 1,559,012 |
Outstanding at end of period (in shares) | 1,559,012 | 1,559,012 | 1,559,012 | 1,559,012
Exercisable at end of period (in shares) | 1,559,012 |  | 1,559,012 |
Weighted-Average Exercise Price Per Share |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 11.60 | $ 11.60 | $ 11.60 |
Outstanding at end of period (in dollars per share) | 11.60 | $ 11.60 | 11.60 | $ 11.60
Exercisable at end of period (in dollars per share) | $ 11.60 |  | $ 11.60 |
Weighted-Average Remaining Contract Term |  |  |  |
Outstanding | 3 years 10 months 24 days | 4 years 1 month 24 days | 3 years 10 months 24 days | 4 years 7 months 6 days
Exercisable at end of period | 3 years 10 months 24 days |  | 3 years 10 months 24 days |
Aggregated Intrinsic Value |  |  |  |
Outstanding | $ 11,377 | $ 12,390 | $ 11,377 | $ 14,105
Exercisable at end of period | $ 11,377 |  | $ 11,377 |

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