Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010
Consolidated Statements of Operations [Abstract]
Revenue	$ 229,027	$ 83,921	$ 538,403		$ 158,361
Cost of sales	138,832	52,578	318,949		102,872
Gross profit	90,195	31,343	219,454		55,489
Selling, general and administrative expenses	15,690	4,669	36,219		11,384
(Gain) loss on disposal of assets	53		(20)		1,582
Operating income	74,452	26,674	183,255		42,523
Other income (expense):
Interest expense, net	(666)	(3,866)	(3,824)		(13,444)
Loss on early extinguishment of debt			(7,605)
Other income (expense), net	(1)	(81)	(40)		(38)
Total other expense, net	(667)	(3,947)	(11,469)		(13,482)
Income before income taxes	73,785	22,727	171,786		29,041
Income tax expense	27,511	8,917	63,189		11,271
Net income	$ 46,274	$ 13,810	$ 108,597	[1]	$ 17,770
Net income per common share (see Note 1):
Basic	$ 0.92	$ 0.30	$ 2.24		$ 0.38
Diluted	$ 0.89	$ 0.29	$ 2.18		$ 0.37
Weighted average common shares outstanding:
Basic	50,315	46,323	48,448		46,323
Diluted	52,205	48,259	49,863		47,689

[1] Unaudited