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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property Plant and Equipment Property, Plant and Equipment
Property, plant and equipment were as follows (in thousands):
20212020
Land and improvements$42,195 $26,529 
Buildings and improvements280,947 277,449 
Manufacturing equipment384,617 340,838 
Office, warehouse and automotive equipment61,994 54,211 
Additions in progress105,520 39,354 
Total property, plant and equipment875,273 738,381 
Accumulated depreciation(424,212)(387,631)
Net property, plant and equipment$451,061 $350,750 

Depreciation expense was $40.0 million in 2021, $38.0 million in 2020 and $32.0 million in 2019.