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Revenue (Tables)
 3 Months Ended
Mar. 31, 2014
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,
 
2014
 
2013
Revenue:
 
 
 
Products
$
82,406

 
$
56,330

Rentals
13,923

 
15,740

Services
6,246

 
6,173

 
$
102,575

 
$
78,243

Cost of revenue:
 
 
 
Products
$
47,732

 
$
34,516

Rentals
6,513

 
6,517

Services
2,715

 
2,737

Depreciation
1,934

 
1,843

 
$
58,894

 
$
45,613