CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues	$ 443,029	$ 252,896	$ 824,790	$ 466,040
Cost of revenues	242,991	139,478	444,243	269,092
Selling, general and administrative expenses	35,956	29,478	72,013	57,315
Depreciation and amortization	44,893	33,384	84,430	65,645
Gain on disposition of assets, net	(78)	(1,533)	(1,489)	(669)
Operating profit	119,267	52,089	225,593	74,657
Interest expense	(998)	(502)	(2,077)	(1,043)
Interest income	3	9	7	32
Other (expense) income, net	(10)	(288)	324	115
Income before income taxes	118,262	51,308	223,847	73,761
Income tax provision	45,097	19,706	85,158	28,759
Net income	$ 73,165	$ 31,602	$ 138,689	$ 45,002
Earnings per share
Basic	$ 0.50	$ 0.22	$ 0.96	$ 0.31
Diluted	$ 0.50	$ 0.21	$ 0.94	$ 0.31
Dividends per share	$ 0.070	$ 0.027	$ 0.140	$ 0.054
Average shares outstanding
Basic	145,215	144,990	145,115	144,894
Diluted	146,842	146,126	146,984	146,222