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Revenue
 12 Months Ended
Dec. 31, 2016
Revenue [Abstract]  
Revenue
Revenue
The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products or services. 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