CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 11,392	$ (41,209)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation, depletion and amortization	36,255	39,063
Impairment of property and equipment	3,406	69,537
Abandonments and impairments	3,839	810
Gain on sales of assets and impairment of inventory, net	(4,640)	(362)
Deferred income tax expense (benefit)	6,465	(24,831)
Non-cash employee compensation	3,424	1,471
Loss on derivatives	5,041	6,535
Cash settlements of derivatives	(1,137)	(445)
Accretion of asset retirement obligations	886	1,068
Amortization of debt issue costs and original issue discount	704	570
Amortization of deferred revenue from volumetric production payment	(2,010)	(2,274)
Changes in operating working capital:
Accounts receivable	(4,074)	1,102
Accounts payable	5,051	(12,386)
Other	14,701	5,645
Net cash provided by operating activities	79,303	44,294
CASH FLOWS FROM INVESTING ACTIVITIES
Additions to property and equipment	(99,419)	(74,461)
Proceeds from volumetric production payment	296	440
Proceeds from sales of assets	68,979	481
Decrease in equipment inventory	3,389	3,890
Other	42	(1,792)
Net cash used in investing activities	(26,713)	(71,442)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	0	35,000
Repayments of long-term debt	(40,000)	0
Net cash provided by (used in) financing activities	(40,000)	35,000
NET INCREASE IN CASH AND CASH EQUIVALENTS	12,590	7,852
CASH AND CASH EQUIVALENTS
Beginning of period	26,623	10,726
End of period	39,213	18,578
SUPPLEMENTAL DISCLOSURES
Cash paid for interest, net of amounts capitalized	176	3,244
Cash paid for income taxes	$ 400	$ 0