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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2016 and 2015 (in thousands):
 
2016
 
2015
Machinery and equipment
$
133,455

 
$
123,211

Vehicles
54,165

 
51,673

Furniture and fixtures
21,513

 
20,730

Computer hardware/software
87,416

 
95,993

Land, buildings and leasehold improvements
90,215

 
88,877

Construction in progress
7,544

 
5,688

 
394,308

 
386,172

Accumulated depreciation and amortization
(266,357
)
 
(264,154
)
 
$
127,951

 
$
122,018