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Basis of Presentation - Reclassifications to Previously Reported Amounts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Service |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues | $ 65,726 | $ 55,501 | $ 193,951 | $ 162,501
Service | As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues |  | 60,981 |  | 178,865
Service | Blackhawk adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues |  | (5,480) |  | (16,364)
Product |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues | $ 19,421 | 16,230 | $ 58,474 | 61,526
Product | As previously reported |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues |  | 10,750 |  | 45,162
Product | Blackhawk adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Cost of revenues |  | $ 5,480 |  | $ 16,364

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