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Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 67,941	$ 54,448	$ 119,716	$ 97,076
Sand sales revenue
Disaggregation of Revenue [Line Items]
Revenue	26,862	34,626	48,008	56,913
Reservation Revenue
Disaggregation of Revenue [Line Items]
Revenue	4,500	5,838	9,000	12,466
Shortfall Revenue
Disaggregation of Revenue [Line Items]
Revenue	16,283	668	22,039	668
Logistics revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 20,296	$ 13,316	$ 40,669	$ 27,029
Product Concentration Risk | Percentage of Total Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Product Concentration Risk | Percentage of Total Revenue | Sand sales revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	39.00%	64.00%	40.00%	58.00%
Product Concentration Risk | Percentage of Total Revenue | Reservation Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	7.00%	11.00%	8.00%	13.00%
Product Concentration Risk | Percentage of Total Revenue | Shortfall Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	24.00%	1.00%	18.00%	1.00%
Product Concentration Risk | Percentage of Total Revenue | Logistics revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	30.00%	24.00%	34.00%	28.00%

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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.

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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.

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