Accrued Liabilities and Other Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accrued Liabilities
Accrued product related costs	$ 5,556	$ 5,245
Accrued income taxes	9,826	8,845
Accrued property and other taxes	1,917	1,838
Dividends payable	1,309	1,302
Remediation reserves	18,176	20,603	$ 3,918	$ 5,116
Other accrued liabilities	8,924	9,341
Total accrued expenses and other liabilities	$ 45,708	$ 47,174