Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 52,786	$ 49,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion, and amortization	66,187	39,975
Impairment expense	16,498	2,509
Accretion expense	1,430	932
Loss on sale of assets		87
Amortization of loan costs	2,243	1,473
Amortization of debt discount	195
Dry hole expense	6,452	292
Expired leases	93
Unrealized (gain) on derivatives	(28,721)	(26,603)
(Gain) on contract settlement	(1,285)
Interest converted into debt	897	890
Settlement of asset retirement obligation	(702)	(658)
Changes in assets and liabilities:
Accounts receivable	(4,807)	(1,376)
Other receivables	3,641	(1,271)
Prepaid expenses and other non-current assets	(4,142)	(7,445)
Accounts payable, accrued liabilities, and other long-term liabilities	4,641	(20,830)
NET CASH PROVIDED BY OPERATING ACTIVITIES	115,406	37,150
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures for property and equipment	(147,989)	(66,307)
Acquisitions	(66,592)	(101,359)
NET CASH USED IN INVESTING ACTIVITIES	(214,581)	(167,666)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from long-term debt	100,500	256,500
Repayments of long-term debt		(162,343)
Additions to deferred financing costs	(1,589)	(7,584)
Capital contributions		50,000
Capital distributions		(235)
NET CASH PROVIDED BY FINANCING ACTIVITIES	98,911	136,338
NET INCREASE (DECREASE) IN CASH	(264)	5,822
CASH AND CASH EQUIVALENTS, beginning of period	4,836	4,274
CASH AND CASH EQUIVALENTS, end of period	4,572	10,096
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid during the period for interest	15,734	14,204
Cash paid during the period for taxes	0	0
Change in property asset retirement obligations, net	3,252	(3)
Change in accruals or liabilities for capital expenditures	$ (13,482)	$ 22,145