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Property and equipment
12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property and equipment
Property and equipment
Property and equipment consists of the following (in thousands):
 
 
 
 
December 31,
 
 
Estimated useful lives
 
2013
 
2012
Land
 
 
 
$
6,718

 
$
3,926

Buildings and leasehold improvements
 
7-20
 
53,025

 
47,390

Computer equipment
 
3-5
 
29,374

 
14,227

Machinery & equipment
 
5-10
 
102,937

 
94,198

Furniture & fixtures
 
3-10
 
6,625

 
12,678

Vehicles
 
3-5
 
11,247

 
11,328

Construction in progress
 
 
 
25,202

 
13,427

 
 
 
 
235,128

 
197,174

Less: accumulated depreciation
 
 
 
(88,526
)
 
(79,343
)
Property & equipment, net
 
 
 
146,602

 
117,831

 
 
 
 
 
 
 
Rental equipment
 
3-10
 
110,455

 
105,162

Less: accumulated depreciation
 
 
 
(76,765
)
 
(70,010
)
Rental equipment, net
 
 
 
33,690

 
35,152

 
 
 
 
 
 
 
Total property & equipment, net
 
 
 
$
180,292

 
$
152,983


Depreciation expense was $36.2 million, $31.5 million and $26.2 million for the years ended December 31, 2013, 2012 and 2011.