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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 51,775	$ 42,628
Sand sales revenue
Disaggregation of Revenue [Line Items]
Revenue	21,147	22,287
Reservation Revenue
Disaggregation of Revenue [Line Items]
Revenue	4,500	6,628
Shortfall Revenue
Disaggregation of Revenue [Line Items]
Revenue	5,756	0
Logistics revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 20,372	$ 13,713
Product Concentration Risk | Percentage of Total Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%
Product Concentration Risk | Percentage of Total Revenue | Sand sales revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	41.00%	52.00%
Product Concentration Risk | Percentage of Total Revenue | Reservation Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	9.00%	16.00%
Product Concentration Risk | Percentage of Total Revenue | Shortfall Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	11.00%	0.00%
Product Concentration Risk | Percentage of Total Revenue | Logistics revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	39.00%	32.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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