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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment For financial reporting purposes, provisions for depreciation are calculated on a straight-line basis over the following estimated useful lives of the underlying assets:
Property, Plant and Equipment ClassificationEstimated Useful Lives
Buildings and improvements
30-40 years
Machinery and equipment
5-15 years
Office equipment
3-10 years
Our “Property, plant and equipment, net” line item in the consolidated statements of financial position consisted of the following:
As of December 31,
(Dollars in thousands)20202019
Land and improvements$22,589 $21,697 
Buildings and improvements155,669 165,968 
Machinery and equipment324,773 281,771 
Office equipment59,001 68,349 
Property plant and equipment, gross562,032 537,785 
Accumulated depreciation(365,844)(341,119)
Property, plant and equipment, net196,188 196,666 
Equipment in process76,190 63,580 
Total property, plant and equipment, net$272,378 $260,246