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Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 233,073	$ 212,470	$ 137,212
Revenue from Contract with Customer | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Sand [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 109,621	$ 143,533	$ 80,200
Sand [Member] | Revenue from Contract with Customer | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	47.00%	67.00%	59.00%
Shortfall Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 49,259	$ 6,032	$ 1,244
Shortfall Revenues [Member] | Revenue from Contract with Customer | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	21.00%	3.00%	1.00%
Logistics [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 74,193	$ 62,905	$ 55,768
Logistics [Member] | Revenue from Contract with Customer | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration Risk, Percentage	32.00%	30.00%	40.00%

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.

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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/disclosureRef
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