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Revenue | 12 Months Ended
--- | ---
Dec. 31, 2017
Revenue [Abstract] |
Revenue | Revenue The Company differentiates revenue and cost of revenue (excluding depreciation and amortization) based on whether the source of revenue is attributable to products or services. 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 Revenue. + References No definition available. + Details
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- Definition Revenues and Cost of Revenues by Product Rental or Service Source + References No definition available. + Details
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