CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends declared and paid:
Common stock dividends (in dollars per share)	$ 0.5200	$ 0.5150
Issuance of common stock:
Director compensation (in shares)	8,324	6,112
Stock purchase plan (in shares)	1,715	1,477
ATM equity program (in shares)	30,000
Restricted shares, net of forfeitures (in shares)	287,957	253,406
Common stock dividends declared and paid	$ (90,270)	$ (87,528)
Director compensation	267	298
Capital in Excess of Par Value
Issuance of common stock:
Common stock dividends declared and paid	578	620
Director compensation	$ 267	$ 298
Series F Preferred Stock
Dividends declared and paid:
Preferred stock dividends (in dollars per share)	$ 0.3250	$ 0.3250