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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 65,690 | $ 63,146 | $ 185,406 | $ 160,222
Sand sales revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 25,153 | 39,500 | 73,161 | 96,417
Reservation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 4,500 | 5,190 | 13,500 | 17,656
Shortfall revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 15,620 | 1,426 | 37,659 | 2,094
Logistics revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 20,417 | $ 17,030 | $ 61,086 | $ 44,055
Product Concentration Risk | Percentage of Total Revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Total Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Product Concentration Risk | Percentage of Total Revenue | Sand sales revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Total Revenue | 38.00% | 63.00% | 40.00% | 60.00%
Product Concentration Risk | Percentage of Total Revenue | Reservation revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Total Revenue | 7.00% | 8.00% | 7.00% | 11.00%
Product Concentration Risk | Percentage of Total Revenue | Shortfall revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Total Revenue | 24.00% | 2.00% | 20.00% | 1.00%
Product Concentration Risk | Percentage of Total Revenue | Logistics revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Percentage of Total Revenue | 31.00% | 27.00% | 33.00% | 28.00%

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