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Business Segment, Geographic and Major Customer Information - Geographic Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | $ 70,989 | $ 79,458 | $ 190,591 | $ 244,589
U.S. |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 45,269 | 66,638 | 137,915 | 203,123
Other countries |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 25,720 | $ 12,820 | $ 52,676 | $ 41,466
Saudi Arabia |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | $ 13,200 |  |  |
Sales | Geographic Concentration Risk | Saudi Arabia |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of revenue by major customers | 18.60% |  |  |

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