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Revenue (Tables)
 12 Months Ended
Dec. 31, 2016
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
Revenue and cost of revenue by source are as follows (in thousands):
 
Year ended December 31,
 
2016
 
2015
 
2014
Revenue:
 
 
 
 
 
Products
$
256,263

 
$
258,968

 
$
304,973

Services
6,569

 
10,998

 
14,879

 
$
262,832

 
$
269,966

 
$
319,852

Cost of Revenue:
 
 
 
 
 
Products
$
162,487

 
$
164,837

 
$
179,258

Services
7,768

 
7,196

 
8,257

Depreciation
1,899

 
1,627

 
1,573

 
$
172,154

 
$
173,660

 
$
189,088