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

Property, plant and equipment consist of the following (in thousands):

December 31,
20172016
Land and land improvements$37,525$35,720
Buildings and leasehold improvements294,219274,021
Production and other equipment484,475438,604
Construction in progress22,14020,204
Total property, plant and equipment838,359768,549
Less: accumulated depreciation and amortization(489,081)(431,431)
Property, plant and equipment, net$349,278$337,118