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Accrued Liabilities (Details) - USD ($) | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Contract liabilities (Note 3) | $ 902,000 |  | $ 1,234,000
Accrued remediation contingency (Note 14) | 1,223,000 |  | 0
Other accrued liabilities | 2,775,000 |  | 4,865,000
Total other accrued liabilities | $ 4,900,000 | $ 6,077,000 | $ 6,099,000

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