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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment consisted of the following at December 31:
(In thousands)
2019
 
2018
Land
$
11,869

 
$
11,338

Buildings and improvements
130,895

 
131,128

Machinery and equipment
295,622

 
291,081

Computer hardware and software
40,880

 
35,730

Furniture and fixtures
5,921

 
5,725

Construction in progress
13,091

 
12,960

 
498,278

 
487,962

Less accumulated depreciation
(259,205
)
 
(239,643
)
 
239,073

 
248,319

 
 
 
 
Composite mats (rental fleet)
125,300

 
120,644

Less accumulated depreciation - composite mats
(53,964
)
 
(52,670
)
 
71,336

 
67,974

 
 
 
 
Property, plant and equipment, net
$
310,409

 
$
316,293