CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 43,099	$ 57,989	$ 90,557	$ 107,356
Cost of sales (exclusive of depreciation and amortization shown below)	39,568	50,818	87,474	101,788
Depreciation and amortization	7,311	8,323	14,714	16,735
Gross loss	(3,780)	(1,152)	(11,631)	(11,167)
Selling, general and administrative expenses (exclusive of depreciation and amortization shown below)	9,784	10,685	19,816	20,292
Depreciation and amortization	398	620	796	1,234
Other operating expenses (income)	89	(55)	18	(59)
Operating loss	(14,051)	(12,752)	(32,261)	(32,984)
Other expense:
Interest expense, net	(2,286)	(2,084)	(4,363)	(4,101)
Other income, net	132	31	425	8
Nonoperating income (expense), total	(2,154)	(2,053)	(3,938)	(4,093)
Loss before income taxes	(16,205)	(14,805)	(36,199)	(37,077)
Income tax expense	0	7	0	7
Net loss	$ (16,205)	$ (14,812)	$ (36,199)	$ (37,084)
Loss per share:
Basic	$ (0.57)	$ (0.55)	$ (1.29)	$ (1.38)
Diluted	(0.57)	(0.55)	(1.29)	(1.38)
Other information:
Dividends declared per common share	$ 0	$ 0	$ 0	$ 0
Russia Proppant
Loss on sale of Russia proppant business	$ 0	$ 350	$ 0	$ 350