CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 48,148	$ (31,287)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	112,242	109,863
Impairment of property and equipment	3,406	89,811
Abandonments and impairments	8,752	2,980
Gain on sales of assets and impairment of inventory, net	(9,069)	(1,527)
Deferred income tax expense (benefit)	27,319	(18,693)
Non-cash employee compensation	9,979	(5,897)
Loss on derivatives	3,715	9,919
Cash settlements of derivatives	(4,777)	(1,364)
Accretion of asset retirement obligations	2,723	3,169
Amortization of debt issue costs and original issue discount	2,329	2,281
Amortization of deferred revenue from volumetric production payment	(5,855)	(6,639)
Changes in operating working capital:
Accounts receivable	(1,434)	(188)
Accounts payable	3,539	(4,060)
Other	10,728	5,513
Net cash provided by operating activities	211,745	153,881
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment	(311,968)	(208,022)
Proceeds from volumetric production payment	810	1,034
Proceeds from sales of assets	104,634	197,941
Decrease in equipment inventory	9,655	5,818
Other	(325)	(1,169)
Net cash used in investing activities	(197,194)	(4,398)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	29,522	43,000
Repayments of long-term debt	(40,000)	(180,000)
Proceeds from exercise of stock options	130	0
Net cash used in financing activities	(10,348)	(137,000)
NET INCREASE IN CASH AND CASH EQUIVALENTS	4,203	12,483
CASH AND CASH EQUIVALENTS
Beginning of period	26,623	10,726
End of period	30,826	23,209
SUPPLEMENTAL DISCLOSURES
Cash paid for interest, net of amounts capitalized	23,929	20,968
Cash paid for income taxes	$ 1,600	$ 0