CONDENSED CONSOLIDATED STATEMENT OF INCOME (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating revenue:
Oil production	$ 142,393	$ 184,498	$ 280,682	$ 371,423
Gas production	46,667	47,832	103,029	84,654
Natural gas liquids production	15,936	11,200	43,906	20,378
Other operational income	2,050	979	3,047	1,786
Derivative income, net		1,368		147
Total operating revenue	207,046	245,877	430,664	478,388
Operating expenses:
Lease operating expenses	49,454	50,517	96,357	103,561
Transportation, processing and gathering expenses	14,098	8,896	28,724	14,293
Production taxes	3,257	4,091	6,319	6,180
Depreciation, depletion and amortization	92,835	87,209	175,481	162,644
Accretion expense	7,733	8,318	15,288	16,581
Salaries, general and administrative expenses	16,637	15,198	32,966	29,150
Incentive compensation expense	3,903	2,050	7,037	3,481
Other operational expenses		73	212	145
Derivative expense, net	2,516		3,115
Total operating expenses	190,433	176,352	365,499	336,035
Income from operations	16,613	69,525	65,165	142,353
Other (income) expenses:
Interest expense	9,913	8,895	18,270	18,530
Interest income	(193)	(115)	(336)	(232)
Other income	(722)	(682)	(1,429)	(1,408)
Other expense	179		179
Total other (income) expenses	9,177	8,098	16,684	16,890
Income before income taxes	7,436	61,427	48,481	125,463
Provision (benefit) for income taxes:
Current		(6,993)		(10,739)
Deferred	2,992	29,398	18,094	56,422
Total income taxes	2,992	22,405	18,094	45,683
Net income	$ 4,444	$ 39,022	$ 30,387	$ 79,780
Basic earnings per share	$ 0.08	$ 0.78	$ 0.59	$ 1.60
Diluted earnings per share	$ 0.08	$ 0.78	$ 0.59	$ 1.60
Average shares outstanding	52,050	48,687	50,540	48,653
Average shares outstanding assuming dilution	52,373	48,725	50,727	48,691