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Revenue (Tables)
 12 Months Ended
Dec. 31, 2017
Revenue [Abstract]  
Differentiation of revenue and cost of revenue
Revenue and cost of revenue (excluding depreciation and amortization) by source are as follows (in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Revenue:
 
 
 
 
 
Products
$
310,716

 
$
256,263

 
$
258,968

Services
6,382

 
6,569

 
10,998

 
$
317,098

 
$
262,832

 
$
269,966

Cost of revenue (excluding depreciation and amortization):
 
 
 
 
 
Products
$
210,281

 
$
162,488

 
$
164,837

Services
4,848

 
7,767

 
7,196

 
$
215,129

 
$
170,255

 
$
172,033