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SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Mar. 15, 2019 | Feb. 01, 2019 | Jan. 27, 2019 | Nov. 23, 2018 | Aug. 24, 2018 | May 25, 2018 | Mar. 09, 2018 | Feb. 01, 2018 | Nov. 24, 2017 | Aug. 31, 2017 | May 19, 2017 | Mar. 03, 2017 | Jan. 24, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common stock outstanding (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.77 | $ 1.52
Cash dividends paid per common stock outstanding (in dollars per share) |  |  |  | $ 0.16 | $ 0.15 | $ 0.14 | $ 0.13 |  | $ 0.12 | $ 0.11 | $ 0.10 | $ 0.09 |  | $ 2.77 | $ 1.52
Special cash dividend paid per common stock outstanding (in dollars per share) |  |  |  | $ 0.18 | $ 0.25 | $ 1.76 |  |  | $ 0.15 | $ 0.25 | $ 0.35 | $ 0.35 |  |  |
2016 Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  |  |  |  |  |  |  | 34,202 |  |  |  |  | 56,260 | 34,202 | 56,260
Shares vesting period |  |  |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |
Value of shares granted |  |  |  |  |  |  |  | $ 554 |  |  |  |  | $ 1,400 |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common stock outstanding (in dollars per share) |  |  | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |
Special cash dividend declared per common stock outstanding (in dollars per share) |  |  | $ 0.08 |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends paid per common stock outstanding (in dollars per share) | $ 0.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Special cash dividend paid per common stock outstanding (in dollars per share) | $ 0.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 2016 Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted (in shares) |  | 22,603 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vesting period |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares granted |  | $ 377 |  |  |  |  |  |  |  |  |  |  |  |  |

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