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Revenue (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
 
2013
 
2012
Revenue:
 
 
 
Products
$
56,330

 
$
57,256

Rentals
15,740

 
18,066

Services
6,173

 
3,873

 
$
78,243

 
$
79,195

Cost of revenue:
 
 
 
Products
$
34,516

 
$
34,485

Rentals
6,517

 
8,013

Services
2,737

 
1,556

Depreciation
1,843

 
1,690

 
$
45,613

 
$
45,744