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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