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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Our investment in property, plant and equipment consisted of the following at December 31:
(In thousands)
2017
 
2016
Land
$
11,504

 
$
11,505

Buildings and improvements
132,322

 
121,967

Machinery and equipment
284,337

 
248,229

Computer hardware and software
33,738

 
30,544

Furniture and fixtures
5,926

 
5,829

Construction in progress
8,607

 
19,417

 
476,434

 
437,491

Less accumulated depreciation
(215,419
)
 
(186,700
)
 
261,015

 
250,791

 
 
 
 
Composite mats (rental fleet)
101,968

 
100,543

Less accumulated depreciation - composite mats
(47,663
)
 
(47,680
)
 
54,305

 
52,863

 
 
 
 
Property, plant and equipment, net
$
315,320

 
$
303,654