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Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue: |  |  |  |  |  |  |  |  |  |  |
Products |  |  |  |  |  |  |  |  | $ 310,716 | $ 256,263 | $ 258,968
Services |  |  |  |  |  |  |  |  | 6,382 | 6,569 | 10,998
Total revenues | $ 72,509 | $ 79,458 | $ 85,177 | $ 79,954 | $ 70,604 | $ 64,337 | $ 64,079 | $ 63,812 | 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
Total cost of revenue |  |  |  |  |  |  |  |  | $ 215,129 | $ 170,255 | $ 172,033

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- Definition Total costs related to services rendered by an entity during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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