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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Account receivable, allowances aggregating | $ 27,799 | $ 29,249
Closure and post-closure liabilities, current portion | 6,444 | 6,220
Remedial liabilities, current portion | $ 13,338 | $ 13,796
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) | 56,501,190 | 57,297,978
Common stock, outstanding shares (in shares) | 56,501,190 | 57,297,978

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