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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant, and Equipment

The table below sets forth the reclassification and components of property, plant and equipment as of December 31, 2017 and 2016:

 

 

(in thousands)   2017   2016   Estimated useful life
             
Land and land improvements   $14,853     $13,339     25 years for improvements
                 
Buildings   230,987     214,086     25 to 40 years
                 
Building under capital lease   8,140     8,140     7 years
                 
Machinery and equipment   950,519     842,921     5 to 15 years
                 
Furniture and fixtures   8,861     7,632     5 years
                 
Computer and other equipment   15,610     15,264     3 to 10 years
                 
Software   57,847     54,212     5 to 8 years
                 
Capital expenditures in progress   63,951     66,900      
                 
Property, plant and equipment, gross   1,350,768     1,222,494      
                 
Accumulated depreciation and amortization   (896,466 )   (799,930 )    
                 
Property, plant and equipment, net   $454,302     $422,564