Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenues	$ 581,383	$ 487,582	$ 695,802
Cost of sales:
Cost of sales	519,217	441,066	584,566
Asset impairments	0	0	345,010
Total cost of sales	519,217	441,066	929,576
Gross profit (loss)	62,166	46,516	(233,774)
Goodwill impairments	0	(45,107)	(16,399)
Gain (loss) on disposition of assets, net	(39)	1,290	92
Selling, general and administrative expenses	(63,257)	(65,934)	(57,279)
Loss from operations	(1,130)	(63,235)	(307,360)
Equity in losses of investments	(2,368)	(2,166)	(124,345)
Net interest expense	(18,778)	(31,239)	(26,914)
Loss on early extinguishment of long-term debt	(397)	(3,540)	0
Other income (expense), net	(1,434)	3,510	(24,310)
Other income – oil and gas	3,735	2,755	4,759
Loss before income taxes	(20,372)	(93,915)	(478,170)
Income tax benefit	(50,424)	(12,470)	(101,190)
Net income (loss)	$ 30,052	$ (81,445)	$ (376,980)
Earnings (loss) per share of common stock (in dollars per share)
Basic	$ 0.20	$ (0.73)	$ (3.58)
Diluted	$ 0.20	$ (0.73)	$ (3.58)
Weighted average common shares outstanding (in shares)
Basic	145,295	111,612	105,416
Diluted	145,300	111,612	105,416