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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stockholders' Equity Attributable to Parent |  |
Common dividends declared - per share (in dollars per share) | $ 0.79 | $ 0.75
Issuance of shares of common stock, common stock offering, net of expenses | 317,538 | 105,837
Withheld shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock | 30,252 | 33,963

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