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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment consisted of the following at December 31:
(In thousands)
2018
 
2017
Land
$
11,338

 
$
11,504

Buildings and improvements
131,128

 
132,322

Machinery and equipment
291,081

 
284,337

Computer hardware and software
35,730

 
33,738

Furniture and fixtures
5,725

 
5,926

Construction in progress
12,960

 
8,607

 
487,962

 
476,434

Less accumulated depreciation
(239,643
)
 
(215,419
)
 
248,319

 
261,015

 
 
 
 
Composite mats (rental fleet)
120,644

 
101,968

Less accumulated depreciation - composite mats
(52,670
)
 
(47,663
)
 
67,974

 
54,305

 
 
 
 
Property, plant and equipment, net
$
316,293

 
$
315,320