Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net revenues	$ 107,267	$ 166,016	$ 198,306	$ 355,657
Cost of sales	101,609	141,808	209,578	296,502
Gross profit (loss)	5,658	24,208	(11,272)	59,155
Selling, general and administrative expenses	(14,953)	(16,534)	(28,779)	(29,153)
Income (loss) from operations	(9,295)	7,674	(40,051)	30,002
Equity in losses of investments	(121)	(323)	(244)	(302)
Net interest expense	(7,480)	(5,235)	(18,164)	(9,305)
Gain on repurchase of long-term debt	302	0	302	0
Other income (expense), net	1,308	(5,036)	3,188	(6,192)
Other income – oil and gas	396	899	2,968	3,825
Income (loss) before income taxes	(14,890)	(2,021)	(52,001)	18,028
Income tax provision (benefit)	(4,219)	614	(13,507)	1,021
Net income (loss)	$ (10,671)	$ (2,635)	$ (38,494)	$ 17,007
Earnings (loss) per share of common stock (in dollars per share)
Basic	$ (0.10)	$ (0.03)	$ (0.36)	$ 0.16
Diluted	$ (0.10)	$ (0.03)	$ (0.36)	$ 0.16
Weighted average common shares outstanding (in shares)
Basic	107,767	105,357	106,838	105,324
Diluted	107,767	105,357	106,838	105,324