CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenues	$ 43,572	$ 20,651	$ 78,242	$ 53,753
Cost of sales	57,005	40,663	111,133	97,406
Gross loss	(13,433)	(20,012)	(32,891)	(43,653)
Selling, general and administrative expenses	10,265	10,034	21,062	21,509
(Gain) Loss on disposal or impairment of assets	0	(23)	0	925
Operating loss	(23,698)	(30,023)	(53,953)	(66,087)
Other expense:
Interest expense, net	(1,627)	(1,623)	(3,715)	(2,419)
Other, net	4	8	191	83
Nonoperating income (expense), total	(1,623)	(1,615)	(3,524)	(2,336)
Loss before income taxes	(25,321)	(31,638)	(57,477)	(68,423)
Income tax benefit	(499)	(11,342)	(211)	(23,443)
Net loss	$ (24,822)	$ (20,296)	$ (57,266)	$ (44,980)
Loss per share:
Basic	$ (0.93)	$ (0.88)	$ (2.15)	$ (1.95)
Diluted	(0.93)	(0.88)	(2.15)	(1.95)
Other information:
Dividends declared per common share	$ 0	$ 0	$ 0	$ 0