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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 | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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 2 months 12 days | 3 years 4 months 24 days | 3 years 2 months 12 days | 3 years 7 months 6 days
Exercisable at end of period | 3 years 2 months 12 days |  | 3 years 2 months 12 days |
Aggregated Intrinsic Value |  |  |  |
Outstanding | $ 3,691 | $ 3,488 | $ 3,691 | $ 2,662
Exercisable at end of period | $ 3,691 |  | $ 3,691 |

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