CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 5,668	$ 6,784
Common stock, par value (in USD per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares issued (in shares)	106,878,000	106,457,000
Common stock, shares outstanding (in shares)	84,562,000	85,449,000
Deferred stock units, outstanding (in shares)	90,000	87,000
Treasury stock, shares (in shares)	22,317,000	21,008,000