Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Pro Forma Information Chieftain Sand and Proppant LLC (Details)

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Acquisitions - Pro Forma Information Chieftain Sand and Proppant LLC (Details) - Chieftain Acquisition - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Revenues   $ 35,128 $ 22,847
Net income   10,694 5,520
Depreciation   2,300 2,800
Revenues $ 1,312    
Net loss $ (72)    
Eliminations      
Business Acquisition [Line Items]      
Revenues   $ 9,600 $ 12,300