Acquisition of the New Business - Employees and Operating Results Since Acquisition Date (Details) $ in Thousands		2 Months Ended
	Nov. 02, 2016 USD ($) employee	Dec. 31, 2016 USD ($)
Activated Carbon and Filter Aid Business (New Business)
Purchase of assets and business
Cash paid for acquisition	$ 157,425
Operating results since acquisition date
Net sales		$ 12,100
Loss from operations		$ (8,800)
Activated Carbon and Filter Aid Business (New Business)
Purchase of assets and business
Number of employees | employee	300