Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Net revenues	$ 182,462	$ 340,837	$ 538,119	$ 899,996
Cost of sales	150,493	214,590	446,995	588,765
Gross profit	31,969	126,247	91,124	311,231
Gain on disposition of assets, net			0	10,418
Selling, general and administrative expenses	(13,597)	(19,916)	(42,750)	(69,614)
Income from operations	18,372	106,331	48,374	252,035
Equity in earnings (losses) of investments	(251)	508	(553)	709
Net interest expense	(8,713)	(3,856)	(18,018)	(12,856)
Other income (expense), net	(5)	598	(6,197)	(229)
Other income – oil and gas	571	1,837	4,396	15,709
Income before income taxes	9,974	105,418	28,002	255,368
Income tax provision	94	29,832	1,115	67,778
Net income, including noncontrolling interests	9,880	75,586	26,887	187,590
Less net income applicable to noncontrolling interests			0	(503)
Net income applicable to common shareholders	$ 9,880	$ 75,586	$ 26,887	$ 187,087
Earnings per share of common stock (in dollars per share)
Basic	$ 0.09	$ 0.72	$ 0.25	$ 1.77
Diluted	$ 0.09	$ 0.71	$ 0.25	$ 1.77
Weighted average common shares outstanding (in shares)
Basic	105,438	104,997	105,362	105,038
Diluted	105,438	105,338	105,362	105,374