CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Account receivable, allowances aggregating	$ 45,373	$ 40,140
Closure and post-closure liabilities, current portion	7,808	12,015
Remedial liabilities, current portion	$ 18,585	$ 13,121
Common stock, per value (in USD per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	80,000,000	80,000,000
Common stock, issued shares (in shares)	54,414,189	54,419,321
Common stock, outstanding shares (in shares)	54,414,189	54,419,321