CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred income taxes	$ 1,749	$ 690	$ (2,427)
Stock appreciation rights exercised (in shares)		11,246	28,109
Vesting of restricted stock units (in shares)		196,102	384,134
Vesting of performance shares (in shares)		529,213
Treasury shares repurchased (in shares)		1,766,826	1,321,072
Treasury Stock
Treasury shares repurchased (in shares)		1,766,826	1,321,072