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Quarterly Financial Data (Unaudited) - Blackhawk Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Services | $ 55,501 | $ 55,317 | $ 51,683 | $ 107,000 | $ 162,501 | $ 223,222 | $ 246,652 | $ 384,842
Products | 16,230 | 23,027 | 22,269 | 45,296 | 61,526 | $ 87,200 | 70,616 | 129,748
As previously reported |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Services | 60,981 | 60,777 | 57,107 | 117,884 | 178,865 |  | 201,316 | 304,473
Products | 10,750 | 17,567 | 16,845 | 34,412 | 45,162 |  | $ 59,037 | $ 113,918
Blackhawk | Blackhawk adjustment |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Services | (5,480) | (5,460) | (5,424) | (10,884) | (16,364) |  |  |
Products | $ 5,480 | $ 5,460 | $ 5,424 | $ 10,884 | $ 16,364 |  |  |

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