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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Common stock distributions declared per share $ 0.3625 $ 0.36 $ 0.725 $ 0.72
8.00% Series E Cumulative Convertible Preferred Stock        
Preferred stock distributions declared $ 0.3925 $ 0.3898 $ 0.7850 $ 0.7796