Condensed Consolidated Statement of Operations (Unaudited) (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
Operating revenue:
Oil production	$ 175,357	$ 103,159	$ 327,352	$ 203,724
Gas production	56,513	60,823	102,371	124,049
Other operational income	864	1,431	1,749	2,687
Derivative income, net	1,398	2,225	0	3,413
Total operating revenue	234,132	167,638	431,472	333,873
Operating expenses:
Lease operating expenses	46,734	36,883	85,540	75,547
Other operational expenses	136	2,447	798	2,447
Production taxes	1,801	1,590	4,336	3,244
Depreciation, depletion and amortization	72,646	63,765	140,315	124,418
Accretion expense	7,717	8,462	15,434	16,924
Salaries, general and administrative expenses	10,610	9,963	22,343	20,448
Incentive compensation expense	2,333	421	5,017	1,346
Derivative expenses, net	0		782
Total operating expenses	141,977	123,531	274,565	244,374
Income from operations	92,155	44,107	156,907	89,499
Other (income) expenses:
Interest expense	1,980	2,540	5,091	6,606
Interest income	(53)	(1,002)	(147)	(1,059)
Other income	(563)		(1,127)	(776)
Loss on early extinguishment of debt	607		607	1,820
Other expense	69	209	193	489
Total other (income) expenses	2,040	1,747	4,617	7,080
Net income before income taxes	90,115	42,360	152,290	82,419
Provision (benefit) for income taxes:
Current	(2,362)	(1,392)	(2,362)	(5,264)
Deferred	35,281	15,880	57,664	34,393
Total income taxes	32,919	14,488	55,302	29,129
Net income	$ 57,196	$ 27,872	$ 96,988	$ 53,290
Basic earnings per share	$ 1.17	$ 0.57	$ 1.98	$ 1.10
Diluted earnings per share	$ 1.17	$ 0.57	$ 1.98	$ 1.10
Average shares outstanding	47,961	47,654	47,930	47,631
Average shares outstanding assuming dilution	48,006	47,678	47,973	47,657