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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 consisted of the following at December 31:
(In thousands)20212020
Land$11,820 $11,901 
Buildings and improvements118,395 122,961 
Machinery and equipment282,258 285,678 
Computer hardware and software48,389 46,801 
Furniture and fixtures5,879 5,955 
Construction in progress8,194 6,958 
 474,935 480,254 
Less accumulated depreciation(287,046)(268,862)
 187,889 211,392 
Composite mats (rental fleet)135,975 126,617 
Less accumulated depreciation - composite mats(63,608)(60,313)
 72,367 66,304 
Property, plant and equipment, net$260,256 $277,696 
 
Depreciation expense was $38.5 million, $40.9 million, and $42.8 million in 2021, 2020 and 2019, respectively. Fluids Systems segment includes a $3.0 million impairment charge for 2020, attributable to the abandonment of certain property, plant and equipment.