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Revenue (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599 + Details
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