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Revenue
 3 Months Ended
Mar. 31, 2013
Revenue [Abstract]  
Revenue
Revenue
The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products, rentals or services. 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