CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenues	$ 49,367	$ 34,670
Cost of sales	59,382	54,128
Gross loss	(10,015)	(19,458)
Selling, general and administrative expenses	10,221	10,797
Gain on disposal or impairment of assets	(4)	0
Operating loss	(20,232)	(30,255)
Other expense:
Interest expense, net	(2,017)	(2,088)
Other, net	(23)	187
Nonoperating income (expense), total	(2,040)	(1,901)
Loss before income taxes	(22,272)	(32,156)
Income tax expense	0	288
Net loss	$ (22,272)	$ (32,444)
Loss per share:
Basic	$ (0.83)	$ (1.22)
Diluted	(0.83)	(1.22)
Other information:
Dividends declared per common share	$ 0	$ 0