CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - Unaudited (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stockholders' Equity Attributable to Parent
Common dividends declared - per share (in dollars per share)	$ 0.75	$ 0.72
Issuance of shares of common stock, common stock offering, net of expenses	105,837	232,205
Issuance of shares of common stock, dividend reinvestment plan	0	571
Withheld shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock	33,963	28,955