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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Apr. 02, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 110,173 $ 114,207   $ 0
Noralta        
Business Acquisition [Line Items]        
Cash and cash equivalents     $ 24  
Accounts receivable     21,456  
Inventories     839  
Other current assets     4,266  
Property, plant and equipment     129,424  
Goodwill     123,569  
Intangible assets     110,736  
Total assets acquired     390,314  
Accounts payable and accrued liabilities     15,023  
Income taxes payable     1,038  
Other current liabilities     2,027  
Deferred income taxes     51,543  
Other noncurrent liabilities     5,133  
Total liabilities assumed     74,764  
Net assets acquired     $ 315,550