Condensed Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Net revenues	$ 166,016	$ 305,587	$ 355,657	$ 559,159
Cost of sales	141,808	196,449	296,502	374,175
Gross profit	24,208	109,138	59,155	184,984
Gain (loss) on disposition of assets, net	0	(1,078)	0	10,418
Selling, general and administrative expenses	(16,534)	(29,304)	(29,153)	(49,698)
Income from operations	7,674	78,756	30,002	145,704
Equity in earnings (losses) of investments	(323)	(507)	(302)	201
Net interest expense	(5,235)	(4,517)	(9,305)	(9,000)
Other expense, net	(5,036)	(17)	(6,192)	(827)
Other income – oil and gas	899	1,596	3,825	13,872
Income (loss) before income taxes	(2,021)	75,311	18,028	149,950
Income tax provision	614	17,529	1,021	37,946
Net income (loss), including noncontrolling interests	(2,635)	57,782	17,007	112,004
Less net income applicable to noncontrolling interests			0	(503)
Net income (loss) applicable to common shareholders	$ (2,635)	$ 57,782	$ 17,007	$ 111,501
Earnings (losses) per share of common stock (in dollars per share)
Basic	$ (0.03)	$ 0.55	$ 0.16	$ 1.06
Diluted	$ (0.03)	$ 0.55	$ 0.16	$ 1.05
Weighted average common shares outstanding (in shares)
Basic	105,357	104,992	105,324	105,059
Diluted	105,357	105,295	105,324	105,359