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Other Long-term Liabilities (Details) - Paint and Coatings - USD ($)
$ in Thousands
Jul. 30, 2008
Dec. 31, 2017
Dec. 31, 2016
Other Long-term Liabilities      
Long-term purchase commitment, amount $ 4,800    
Cash received from supplier as discount toward future purchases 300    
Liability related to deferred discount $ 300 $ 92 $ 115