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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (unaudited) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash dividends per share $ 0.18 $ 0.18 $ 0.54 $ 0.54
Retained deficit        
Cash dividends per share $ 0.18 $ 0.18 $ 0.54 $ 0.54