CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Pension and other postretirement adjustments, tax	$ 309	$ 578
Amortization of forward starting swaps, tax	$ 195	$ 351
Issuance of common stock from performance share units and exercise of stock options (in shares)	106,122	131,757
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount	$ 1,865	$ 3,061
Purchase of common stock (in shares)	0	866,823