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STOCKHOLDERS' EQUITY - Cash Dividend Activity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 9 Months Ended
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Jul. 18, 2018 | Apr. 17, 2018 | Feb. 06, 2018 | Sep. 30, 2018
Equity [Abstract] |  |  |  |
Special cash dividends paid, per share (in dollars per share) | $ 0.25 | $ 1.76 |  |
Cash dividends paid, per share (in dollars per share) | $ 0.15 | $ 0.14 | $ 0.13 | $ 2.43
Special cash dividend paid | $ 2,844 | $ 20,022 |  |
Cash dividend paid | $ 1,707 | $ 1,592 | $ 1,479 | $ 27,644

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