Accrued Liabilities and Other Liabilities - Components of Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities
Accrued product-related costs	$ 4,377	$ 5,297
Accrued income taxes	6,914	5,475
Accrued property and other taxes	1,976	997
Accrued Professional Fees, Current	3,350	2,228
Contract with Customer, Liability	1,981	1,595
Dividends payable	1,310	1,318
Remediation reserves	11,274	17,067	$ 18,176	$ 20,603
Other accrued liabilities	6,165	7,367
Total accrued expenses and other liabilities	$ 37,347	$ 41,344