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Intangible Assets, Goodwill and Other Assets (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Intangible Assets, Goodwill And Other Assets [Line Items]      
Amortization of expense of intangible assets $ 18,700 $ 21,800 $ 23,600
Goodwill 301,959 301,959  
Sodium minerals and sulfur services      
Intangible Assets, Goodwill And Other Assets [Line Items]      
Goodwill $ 301,900 301,900  
Onshore facilities and transportation | Supply And Logistics Products And Services [Member]      
Intangible Assets, Goodwill And Other Assets [Line Items]      
Impairment of goodwill   $ 23,100