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Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary of costs and accumulated depreciation for property, plant, and equipment
Property, plant and equipment consisted of the following:
(in thousands)March 31, 2021December 31, 2020
Machinery and equipment $1,392,503 $1,388,735 
Buildings and improvements 17,598 17,598 
Automotive equipment 16,608 16,608 
Land and improvements 14,132 14,132 
Construction in progress 10,746 12,098 
Other2,027 1,721 
1,453,614 1,450,892 
Less: Accumulated depreciation and amortization570,278 553,045 
Total property, plant and equipment, net
$883,336 $897,847