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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment in the accompanying Consolidated Balance Sheets consisted of the following amounts as of December 31, 2017 and 2016 (in thousands):
 
2017
 
2016
Machinery and equipment
$
138,592

 
$
133,455

Vehicles
55,648

 
54,165

Furniture and fixtures
20,195

 
21,513

Computer hardware/software
95,716

 
87,416

Land, buildings and leasehold improvements
92,145

 
90,215

Construction in progress
6,779

 
7,544

 
409,075

 
394,308

Accumulated depreciation and amortization
(281,919
)
 
(266,357
)
 
$
127,156

 
$
127,951


Depreciation and amortization expense related to property, plant and equipment, including capital leases, was $39.9 million, $38.9 million and $36.3 million for the years ended December 31, 2017, 2016 and 2015, respectively.