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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property and equipment
The majority of our property and equipment, including rental equipment, is a direct cost to generating revenue and the following table depicts the depreciation associated with each product line at December 31, 2016 , 2015 and 2014 (in thousands):
 
2016
 
2015
 
2014
Rentals
$
21,325

 
$
22,308

 
$
20,973

Sales
291

 
281

 
339

Service & Maintenance
25

 
16

 
12

Total
$
21,641

 
$
22,605

 
$
21,324

Property and equipment consists of the following at December 31, 2016 and 2015 (in thousands):

 
Useful Lives (Years)
 
2016
 
2015
Land and building
30
 
$
7,025

 
$
7,025

Leasehold improvements
39
 
794

 
794

Office equipment and furniture
5
 
1,454

 
1,380

Software
5
 
573

 
573

Machinery and equipment
7
 
3,111

 
3,105

Vehicles
3
 
6,063

 
6,475

Total

 
19,020

 
19,352

Less accumulated depreciation
 
 
(11,267
)
 
(10,825
)
Total
 
 
$
7,753

 
$
8,527