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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY/(DEFICIT) (Parentheticals) - $ / shares
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY/(DEFICIT)            
Common stock dividends (USD per share) $ 0.235 $ 0.235 $ 0.235 $ 0.225 $ 0.225 $ 0.225