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Revenue (Tables)
 9 Months Ended
Sep. 30, 2013
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
Revenue and cost of revenue by source are as follows (in thousands): 
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
Revenue:
 
 
 
 
 
 
 
Products
$
76,376

 
$
56,621

 
$
204,229

 
$
170,302

Rentals
15,375

 
16,374

 
46,794

 
51,420

Services
6,637

 
5,633

 
19,194

 
14,404

 
$
98,388

 
$
78,628

 
$
270,217

 
$
236,126

Cost of revenue:
 
 
 
 
 
 
 
Products
$
50,367

 
$
32,910

 
$
131,875

 
$
101,528

Rentals
6,868

 
7,806

 
17,666

 
23,312

Services
1,610

 
2,271

 
7,179

 
5,665

Depreciation
2,041

 
1,798

 
5,771

 
5,302

 
$
60,886

 
$
44,785

 
$
162,491

 
$
135,807