CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Dividends declared and paid:
Common stock dividends (in dollars per share)	$ 0.5200	$ 0.5150	$ 1.0400	$ 1.0300
Issuance of common stock:
Director compensation (in shares)	6,875	10,647	15,199	16,759
Stock purchase plan (in shares)	2,017	2,829	3,732	4,306
ATM equity program (in shares)		1,417,977	30,000	1,417,977
Restricted shares, net of forfeitures (in shares)			287,957	253,406
Series F Preferred Stock
Dividends declared and paid:
Preferred stock dividends (in dollars per share)	$ 0.3250	$ 0.3250	$ 0.6500	$ 0.6500