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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Account receivable, allowances aggregating | $ 49,817 | $ 40,140
Closure and post-closure liabilities, current portion | 12,379 | 12,015
Remedial liabilities, current portion | $ 22,172 | $ 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) | 54,110,459 | 54,419,321
Common stock, outstanding shares (in shares) | 54,110,459 | 54,419,321

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