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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Account receivable, allowances aggregating | $ 44,407 | $ 44,749
Closure and post-closure liabilities, current portion | 11,887 | 13,903
Remedial liabilities, current portion | $ 15,009 | $ 12,190
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, authorized shares (in shares) | 80,000,000 | 80,000,000
Common stock, issued shares (in shares) | 54,550,817 | 54,772,696
Common stock, outstanding shares (in shares) | 54,550,817 | 54,772,696

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