Consolidated Statements Of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net revenues	$ 487,582	$ 695,802	$ 1,107,156
Cost of sales:
Cost of sales	441,066	584,566	763,120
Asset impairments	0	345,010	0
Total cost of sales	441,066	929,576	763,120
Gross profit (loss)	46,516	(233,774)	344,036
Goodwill impairments	(45,107)	(16,399)	0
Gain on disposition of assets, net	1,290	92	10,240
Selling, general and administrative expenses	(65,934)	(57,279)	(92,520)
Income (loss) from operations	(63,235)	(307,360)	261,756
Equity in earnings (losses) of investments	(2,166)	(124,345)	879
Net interest expense	(31,239)	(26,914)	(17,859)
Loss on repurchase of long-term debt	(3,540)	0	0
Other income (expense), net	3,510	(24,310)	814
Other income – oil and gas	2,755	4,759	16,931
Income (loss) before income taxes	(93,915)	(478,170)	262,521
Income tax provision (benefit)	(12,470)	(101,190)	66,971
Net income (loss), including noncontrolling interests	(81,445)	(376,980)	195,550
Less net income applicable to noncontrolling interests	0	0	(503)
Net income (loss) applicable to common shareholders	$ (81,445)	$ (376,980)	$ 195,047
Earnings (loss) per share of common stock (in dollars per share)
Basic	$ (0.73)	$ (3.58)	$ 1.85
Diluted	$ (0.73)	$ (3.58)	$ 1.85
Weighted average common shares outstanding (in shares)
Basic	111,612	105,416	105,029
Diluted	111,612	105,416	105,045