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STOCKHOLDERS' EQUITY - Common Stock Dividend (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 12, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Common Stock Dividend |  |  |
Cash distributions per share of common stock (in dollars per share) | $ 0.45 | $ 0.45 | $ 0.45
Cash dividend declared | $ 9,329,000 | $ 9,329,000 | $ 9,036,000
Common Stock |  |  |
Common Stock Dividend |  |  |
Cash distributions per share of common stock (in dollars per share) | $ 0.45 |  |
Cash dividend declared | $ 9,329,000 |  |

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