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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]            
Pension and other postretirement adjustments, tax $ 335 $ 2,799 $ 309 $ 171 $ 62 $ 578
Amortization of forward starting swaps, tax   $ 549 $ 195 $ 197 $ 623 $ 351
Issuance of common stock from performance share units and exercise of stock options (in shares) 34,390 67,476 106,122 191,432 145,263 131,757
Issuance of common stock from exercise of stock options and deferred compensation plans, tax amount $ 178 $ 621 $ 1,865 $ 837 $ 594 $ 3,061
Purchase of common stock (in shares)         9,600 866,823
Cash dividends declared, per common share outstanding (in dollars per share) $ 0.54 $ 1.08   $ 0.50 $ 1.00