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Accrued Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Accrued Liabilities |  |  |
Accrued product related costs | $ 4,716 | $ 5,297 |
Accrued income taxes | 8,512 | 5,475 |
Accrued property and other taxes | 2,080 | 997 |
Accrued professional fees | 3,055 | 2,228 |
Contract with Customer, Liability | 2,664 | 1,595 |
Dividends payable | 1,323 | 1,318 |
Remediation reserves | 14,570 | 17,067 | $ 18,176
Other accrued liabilities | 6,885 | 7,367 |
Total accrued liabilities | $ 43,805 | $ 41,344 |

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