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STOCKHOLDERS' EQUITY - Dividend Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 23, 2018 | Aug. 24, 2018 | May 25, 2018 | Mar. 09, 2018 | Nov. 24, 2017 | Aug. 31, 2017 | May 19, 2017 | Mar. 03, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |
Special dividend per common share (in dollars per share) | $ 0.18 | $ 0.25 | $ 1.76 |  | $ 0.15 | $ 0.25 | $ 0.35 | $ 0.35 |  |
Special dividend amount | $ 2,048 | $ 2,844 | $ 20,022 |  | $ 1,701 | $ 2,833 | $ 3,964 | $ 3,962 |  |
Dividend per common share (in dollars per share) | $ 0.16 | $ 0.15 | $ 0.14 | $ 0.13 | $ 0.12 | $ 0.11 | $ 0.10 | $ 0.09 | $ 2.77 | $ 1.52
Dividend amount | $ 1,820 | $ 1,707 | $ 1,592 | $ 1,479 | $ 1,360 | $ 1,246 | $ 1,133 | $ 1,019 | $ 31,512 | $ 17,218
Payment Date | Nov. 23, 2018 | Aug. 24, 2018 | May 25, 2018 | Mar. 09, 2018 | Nov. 24, 2017 | Aug. 31, 2017 | May 19, 2017 | Mar. 03, 2017 |  |

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