CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited (Parenthetical) - $ / shares	3 Months Ended
	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