Annual report pursuant to Section 13 and 15(d)

Dispositions Dispositions (Details)

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Dispositions Dispositions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 19, 2019
Jun. 28, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 30, 2019
Dispositions [Line Items]            
Net cash proceeds from sale of product line     $ 27,658 $ 0 $ 0  
Net cash proceeds from sale of property     17,600 12,380 $ 0  
Property, plant and equipment, net     1,186,770 1,208,979    
Deferred revenue     6,450 0    
Right-of-use lease asset     57,295 $ 0    
Operating lease liability     $ 55,339      
Sulfate Salts Product Line | Disposed of by sale, not discontinued operations            
Dispositions [Line Items]            
Sale consideration   $ 28,000        
Net cash proceeds from sale of product line   27,658        
Pre-tax gain on sale   11,518        
Net working capital   4,215        
Property, plant and equipment, net   3,276        
Deferred revenue   $ 9,000        
Property sale | Disposed of by sale, not discontinued operations            
Dispositions [Line Items]            
Sale consideration $ 19,100          
Net cash proceeds from sale of property 17,100          
Pre-tax gain on sale 7,150          
Property, plant and equipment, net           $ 10,735
Holdback receivable $ 1,000          
Right-of-use lease asset           3,588
Operating lease liability           $ 3,524