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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Components of Property, plant and equipment          
Property, plant and equipment, gross $ 1,197,037   $ 1,197,037   $ 885,963
Less accumulated depreciation (278,951)   (278,951)   (203,695)
Property, plant and equipment excluding construction in progress 918,086   918,086   682,268
Construction in progress 143,784   143,784   69,512
Property, plant and equipment, net 1,061,870   1,061,870   751,780
Total depreciation expense 18,800 $ 13,300 48,000 $ 35,800  
Interest capitalized related to construction in progress 1,700 $ 700 4,100 $ 1,400  
Land          
Components of Property, plant and equipment          
Property, plant and equipment, gross 22,420   22,420   15,226
Land improvements          
Components of Property, plant and equipment          
Property, plant and equipment, gross 60,064   60,064   56,637
Buildings          
Components of Property, plant and equipment          
Property, plant and equipment, gross 316,830   316,830   217,167
Machinery and equipment          
Components of Property, plant and equipment          
Property, plant and equipment, gross 787,175   787,175   588,447
Vehicles          
Components of Property, plant and equipment          
Property, plant and equipment, gross 1,317   1,317   635
Furniture and office equipment          
Components of Property, plant and equipment          
Property, plant and equipment, gross 8,202   8,202   6,822
Leasehold improvements          
Components of Property, plant and equipment          
Property, plant and equipment, gross 1,029   1,029   1,029
Property Plant and equipment and construction in progress          
Components of Property, plant and equipment          
Accrued and other current liabilities $ 12,000   $ 12,000   $ 9,400