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STOCKHOLDERS' EQUITY Cash Dividends (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jan. 31, 2019 Quarter $ / shares | Mar. 31, 2019 USD ($) $ / shares | Mar. 31, 2018 USD ($) $ / shares
Dividends Declared and Paid [Line Items] |  |  |
Common Stock, Dividends, Number of Quarterly Distributions Declared, Current Fiscal Year | Quarter | 4 |  |
Common Stock, Dividends, Per Share, Declared, Current Fiscal Year, First Quarter | $ 0.17 |  |
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Second Quarter | 0.17 |  |
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Third Quarter | 0.17 |  |
Common Stock, Dividends Per Share Declared, Current Fiscal Year, Fourth Quarter | $ 0.17 |  |
Payments of dividends to stockholders | $ |  | $ (4,937) | $ (4,775)
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.17 | $ 0.16

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