Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 57,831	$ 52,231	$ 100,259	$ 91,061
Cost of sales	83,913	34,811	118,436	61,174
Gross profit	(26,082)	17,420	(18,177)	29,887
Operating expenses:
Selling, general and administrative	10,605	3,399	18,682	6,351
Amortization	741	121	1,483	243
Total operating expenses	11,346	3,520	20,165	6,594
Operating (loss) income	(37,428)	13,900	(38,342)	23,293
Other income (expense):
Interest expense	3,346	61	6,552	146
(Loss) income before income taxes	(40,774)	13,839	(44,894)	23,147
Income tax (benefit) expense	(10,158)	5,314	(11,222)	8,888
Net (loss) income	$ (30,616)	$ 8,525	$ (33,672)	$ 14,259
Net (loss) income per common share - Basic	$ (0.72)	$ 0.21	$ (0.79)	$ 0.34
Net (loss) income per common share - Diluted	$ (0.72)	$ 0.20	$ (0.79)	$ 0.33
Weighted average number of shares outstanding - Basic	42,403,140	41,567,848	42,403,084	41,537,894
Weighted average number of shares outstanding - Diluted	42,403,140	43,550,226	42,403,084	43,490,914