Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net revenues	$ 161,245	$ 182,462	$ 359,551	$ 538,119
Cost of sales	121,061	150,493	330,639	446,995
Gross profit	40,184	31,969	28,912	91,124
Selling, general and administrative expenses	(18,714)	(13,597)	(47,493)	(42,750)
Income (loss) from operations	21,470	18,372	(18,581)	48,374
Equity in losses of investments	(122)	(251)	(366)	(553)
Net interest expense	(6,843)	(8,713)	(25,007)	(18,018)
Gain on repurchase of long-term debt	244	0	546	0
Other income (expense), net	830	(5)	4,018	(6,197)
Other income (expense) – oil and gas	(468)	571	2,500	4,396
Income (loss) before income taxes	15,111	9,974	(36,890)	28,002
Income tax provision (benefit)	3,649	94	(9,858)	1,115
Net income (loss)	$ 11,462	$ 9,880	$ (27,032)	$ 26,887
Earnings (loss) per share of common stock (in dollars per share)
Basic	$ 0.10	$ 0.09	$ (0.25)	$ 0.25
Diluted	$ 0.10	$ 0.09	$ (0.25)	$ 0.25
Weighted average common shares outstanding (in shares)
Basic	113,680	105,438	109,135	105,362
Diluted	113,680	105,438	109,135	105,362