CONSOLIDATED STATEMENT OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating revenue:
Oil production	$ 715,104	$ 761,304	$ 663,958
Gas production	190,580	134,739	170,611
Natural gas liquids production	60,687	48,498	29,996
Other operational income	7,808	3,520	3,938
Derivative income, net		3,428	1,418
Total operating revenue	974,179	951,489	869,921
Operating expenses:
Lease operating expenses	201,153	215,003	175,881
Transportation, processing and gathering expenses	42,172	21,782	8,958
Production taxes	15,029	10,015	9,380
Depreciation, depletion and amortization	350,574	344,365	280,020
Accretion expense	33,575	33,331	30,764
Salaries, general and administrative expenses	59,524	54,648	40,169
Franchise tax settlement	12,590
Incentive compensation expense	15,340	8,113	11,600
Other operational expenses	151	267	2,149
Derivative expense, net	2,090
Total operating expenses	732,198	687,524	558,921
Income from operations	241,981	263,965	311,000
Other (income) expenses:
Interest expense	32,837	30,375	9,289
Interest income	(1,695)	(600)	(420)
Other income	(2,799)	(1,805)	(1,942)
Loss on early extinguishment of debt	27,279	1,972	607
Total other (income) expenses	55,622	29,942	7,534
Income before income taxes	186,359	234,023	303,466
Provision (benefit) for income taxes:
Current	(10,904)	15,022	(20,386)
Deferred	79,629	69,575	129,520
Total income taxes	68,725	84,597	109,134
Net income	$ 117,634	$ 149,426	$ 194,332
Basic earnings per share	$ 2.36	$ 3.03	$ 3.97
Diluted earnings per share	$ 2.36	$ 3.03	$ 3.97
Average shares outstanding	48,693	48,319	47,988
Average shares outstanding assuming dilution	48,735	48,361	48,030