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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Account receivable, allowances aggregating | $ 32,260 | $ 27,799
Closure and post-closure liabilities, current portion | 9,576 | 6,444
Remedial liabilities, current portion | $ 15,680 | $ 13,338
Common stock, par 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) | 55,997,893 | 56,501,190
Common stock, outstanding shares (in shares) | 55,997,893 | 56,501,190

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