CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net income (loss)	$ 38,647	$ (18,791)	$ 13,743
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Earnings from equity method investment	0	(2,207)	(2,187)
Gain on sale of properties	(33,377)	0	0
Change in derivative fair value	(2,403)	(4,088)	(7,680)
Monetization of derivative contracts	0	12,364	0
Depreciation, depletion, and amortization	26,632	23,016	16,194
Impairment	6,025	19,774	0
Accretion of future site restoration	638	474	452
Amortization of deferred financing fees	1,367	937	1,762
Stock-based compensation	2,114	2,091	1,987
Changes in operating assets and liabilities:
Accounts receivable	(13,215)	(7,506)	(182)
Other assets and liabilities	(176)	250	(17)
Accounts payable	27,294	22,024	756
Accrued expenses	(1,892)	3,037	(333)
Net cash provided by operating activities	51,654	51,375	24,495
Investing Activities
Capital expenditures, including purchases and development of properties	(95,043)	(68,552)	(79,012)
Proceeds from the sale of oil and gas properties	127,529	21,549	8,457
Net cash (used in) provided by investing activities	32,486	(47,003)	(70,555)
Financing Activities
Proceeds from exercise of stock options and warrants	83	431	83
Proceeds from issuance of common stock, net of offering costs	0	0	62,346
Proceeds from long-term borrowings	42,000	30,500	50,500
Payments on long-term borrowings	(122,826)	(32,181)	(65,153)
Deferred financing fees	(110)	(844)	(1,758)
Other	(161)	(217)	(52)
Net cash provided by (used in) financing activities	(81,014)	(2,311)	45,966
Effect of exchange rate changes on cash	18	0	(5)
(Decrease) increase in cash	3,144	2,061	(99)
Cash at beginning of year	2,061	0	99
Cash at end of year	5,205	2,061	0
Supplemental disclosure of cash flow information:
Interest paid	3,986	5,180	4,514
Income taxes paid	391	0	(77)
Non-Cash Investing Activities:
Asset retirement obligation cost and liabilities	138	2,588	(8)
Non-cash transfer of investment in joint venture	0	(28,531)	0
Asset retirement obligations associated with property acquisitions and dispositions	$ (1,890)	$ 324	$ 306