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STOCKHOLDERS' EQUITY - Cash Dividend Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
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Mar. 15, 2019 | Mar. 31, 2019
Equity [Abstract] |  |
Special cash dividends paid, per share (in dollars per share) | $ 0.08 |
Cash dividends paid, per share (in dollars per share) | $ 0.16 | $ 0.24
Special cash dividend paid | $ 912 |
Cash dividend paid | $ 1,824 | $ 2,736

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