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Other Assets - Other Noncurrent Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Investments $ 16,261 $ 15,724
Spare parts inventory 2,767 2,756
Catalysts 14,985 14,985
Deposits 357 357
Long term notes receivable 11,307 11,259
Other 15,270 15,801
Total $ 60,947 $ 60,882