CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Total other comprehensive income, deferred income taxes	$ 1,966	$ (1,229)	$ (5,267)	$ (2,118)	$ (1,569)	$ 1,729
Stock appreciation rights exercised (in shares)	1,609	6,744		103	10,216	927
Vesting of restricted stock units and other stock grants (in shares)	10,910	14,211	104,840	984	99,134	94,229
Treasury shares repurchased (in shares)				1,417,556
Stock Issued During Period, Shares, Other			265,151			529,213