CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues and other income:
Oil and gas revenue	$ 667,951	$ 666,912
Interest income	1,108	9,093	4,231
Other income	3,150	775	5,109
Total revenues and other income	672,209	676,780	9,340
Costs and expenses:
Oil and gas production	95,109	83,551
Exploration expenses	97,712	126,409	73,126
General and administrative	160,027	113,579	98,967
Depletion and depreciation	185,707	140,469	2,423
Amortization-deferred financing costs	8,984	16,193	28,827
Interest expense	52,207	65,749	59,582
Derivatives, net	31,490	11,777	28,319
Loss on extinguishment of debt	5,342	59,643
Doubtful accounts expense		(39,782)	39,782
Other expenses, net	1,475	149	1,094
Total costs and expenses	638,053	577,737	332,120
Income (loss) before income taxes	34,156	99,043	(322,780)
Income tax expense (benefit)	101,184	76,686	(77,108)
Net income (loss)	(67,028)	22,357	(245,672)
Accretion to redemption value of convertible preferred units		(24,442)	(77,313)
Net loss attributable to common shareholders/unit holders	$ (67,028)	$ (2,085)	$ (322,985)
Net income (loss) per share attributable to common shareholders (the year ended December 31, 2011 represents the period from May 16, 2011 to December 31, 2011) (Note 16):
Basic (in dollars per share)	$ (0.18)
Diluted (in dollars per share)	$ (0.18)
Weighted average number of shares used to compute net income (loss) per share (the year ended December 31, 2011 represents the period from May 16, 2011 to December 31, 2011) (Note 16):
Basic (in shares)	371,847
Diluted (in shares)	371,847