Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
OPERATING ACTIVITIES:
Net income	$ 10,801	$ 6,711
Adjustments to reconcile net income to net cash provided by operating activities-
Depreciation and amortization	15,654	20,387
Amortization of deferred loan costs	3,325	1,566
Non-cash interest	362	2,336
Accretion expense	1,223	1,288
Unrealized gain on commodity derivatives, net of premium amortization	(16,947)	(3,859)
Unrealized loss on interest rate derivatives	556
Deferred income tax provision (benefit)	11,129	(933)
Share-based compensation	2,227	2,284
Gain on disposal of other property and equipment	(22)	(38)
Other income		(574)
Changes in operating assets and liabilities-
Accounts receivable	1,293	3,023
Prepaid expenses, inventory and other assets	49	1,598
Derivative premiums	4,889	(3,738)
Accounts payable and proceeds due others	(7,681)	1,603
Accrued liabilities and other	(2,386)	(1,717)
Income taxes payable	(381)	(473)
Asset retirement obligations	(278)	(161)
Total adjustments	13,012	22,592
Net cash provided by operating activities	23,813	29,303
INVESTING ACTIVITIES:
Payments for oil and natural gas properties and equipment	(19,600)	(27,476)
Proceeds from sales of oil and natural gas properties	462	478
Payments for other property and equipment	(503)	(721)
Proceeds from sales of other property and equipment	11	4
Net cash used in investing activities	(19,630)	(27,715)
FINANCING ACTIVITIES:
Payments on long-term debt	(235,222)	(37,618)
Proceeds from borrowings on long-term debt	238,166	36,261
Payments for deferred loan costs	(7,003)
Stock repurchased	(117)	(331)
Net cash used in financing activities	(4,176)	(1,688)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	7	(100)
CASH AND CASH EQUIVALENTS, beginning of period	37	129
CASH AND CASH EQUIVALENTS, end of period	44	29
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for income taxes	531	616
Cash paid for interest	12,036	13,518
DISCLOSURE OF NON CASH INVESTING AND FINANCING ACTIVITIES:
Asset retirement obligations	$ (23)	$ 147