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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Account receivable, allowances aggregating | $ 36,398 | $ 44,315
Closure and post-closure liabilities, current portion | 13,491 | 9,592
Remedial liabilities, current portion | $ 17,256 | $ 13,442
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) | 55,859,402 | 55,847,261
Common stock, outstanding shares (in shares) | 55,859,402 | 55,847,261

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