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Property and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property and Equipment
Property and Equipment
Property and equipment consists of the following (in thousands):
 
 
Estimated useful lives
 
December 31,
 
 
 
2018
 
2017
Land
 
 
 
$
9,755

 
$
12,408

Buildings and leasehold improvements
 
5-30
 
103,761

 
90,909

Computer equipment
 
3-5
 
54,721

 
42,074

Machinery & equipment
 
5-10
 
162,110

 
169,203

Furniture & fixtures
 
3-10
 
6,631

 
6,338

Vehicles
 
3-5
 
6,160

 
8,048

Construction in progress
 
 
 
9,155

 
14,589

 
 
 
 
352,293

 
343,569

Less: accumulated depreciation
 
 
 
(180,717
)
 
(160,787
)
Property & equipment, net
 
 
 
171,576

 
182,782

 
 
 
 
 
 
 
Rental equipment
 
3-10
 
9,535

 
70,679

Less: accumulated depreciation
 
 
 
(3,753
)
 
(56,180
)
Rental equipment, net
 
 
 
5,782

 
14,499

 
 
 
 
 
 
 
Total property & equipment, net
 
 
 
$
177,358

 
$
197,281


Depreciation expense was $33.1 million, $34.4 million and $35.6 million for the years ended December 31, 2018, 2017 and 2016, respectively.