Quarterly report pursuant to Section 13 or 15(d)

Sale of Product Line (Details)

v3.19.2
Sale of Product Line (Details) - USD ($)
$ in Thousands
Jun. 28, 2019
Jun. 30, 2019
Dec. 31, 2018
Sale of Product Line [Line Items]      
Property, plant and equipment, net   $ 1,193,178 $ 1,208,979
Sulfate Salts Product Line | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Sale of Product Line [Line Items]      
Consideration for sale of product line $ 28,000    
Pre-tax gain on sale 11,362    
Net working capital 4,215    
Property, plant and equipment, net 3,423    
Deferred revenue $ 9,000