Consolidated Statements Of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Oil and natural gas sales	$ 131,215	$ 129,905	$ 374,452	$ 403,986
Gain (loss) from oil hedging activities	11,468	(6,889)	35,777	(20,450)
Other revenues	0	1,134	0	3,339
Total revenues	142,683	124,150	410,229	386,875
Costs and expenses:
Lease operating	35,278	31,830	98,946	91,134
Production tax	8,748	8,626	24,258	26,706
Depreciation, depletion and amortization	44,421	37,059	119,807	107,913
General and administrative	12,878	11,063	39,165	28,638
Other expenses	0	879	0	2,788
Total costs and expenses	101,325	89,457	282,176	257,179
Operating income	41,358	34,693	128,053	129,696
Non-operating expense:
Interest expense	(24,087)	(24,470)	(72,666)	(72,401)
Non-hedge derivative gains (losses)	(25,030)	93,601	37,035	79,971
Loss on extinguishment of debt	(18)	0	(21,714)	(20,576)
Other income (expenses), net	104	(137)	236	(22)
Net non-operating income (expense)	(49,031)	68,994	(57,109)	(13,028)
Income (loss) before income taxes	(7,673)	103,687	70,944	116,668
Income tax expense (benefit)	(2,727)	39,091	25,645	44,942
Net income (loss)	$ (4,946)	$ 64,596	$ 45,299	$ 71,726