Consolidated Statements Of Operations (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues:
Oil and natural gas sales	$ 115,448	$ 146,482	$ 243,237	$ 274,081
Gain (loss) from oil hedging activities	11,886	(6,806)	24,309	(13,561)
Other revenues	0	1,060	0	2,205
Total revenues	127,334	140,736	267,546	262,725
Costs and expenses:
Lease operating	32,719	31,748	63,668	59,304
Production tax	7,220	9,456	15,510	18,080
Depreciation, depletion and amortization	38,454	36,877	75,386	70,854
General and administrative	12,838	9,567	26,287	17,575
Other expenses	0	827	0	1,909
Total costs and expenses	91,231	88,475	180,851	167,722
Operating income	36,103	52,261	86,695	95,003
Non-operating expense:
Interest expense	(24,423)	(24,221)	(48,579)	(47,931)
Non-hedge derivative gains (losses)	72,528	47,296	62,065	(13,630)
Loss on extinguishment of debt	(21,696)	0	(21,696)	(20,576)
Other income and expenses	127	68	132	115
Net non-operating income (expense)	26,536	23,143	(8,078)	(82,022)
Income before income taxes	62,639	75,404	78,617	12,981
Income tax expense	22,176	28,010	28,372	5,851
Net income	$ 40,463	$ 47,394	$ 50,245	$ 7,130