Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities
Net income	$ 33,137	$ 11,651
Adjustments to reconcile net income to net
Change in derivative fair value	(2,383)	(1,813)
Depreciation, depletion, and amortization	30,817	19,545
Impairment	0	2,135
Amortization of deferred financing fees	779	1,020
Accretion of future site restoration	436	487
Stock-based compensation	2,050	1,662
Changes in operating assets and liabilities:
Accounts receivable	3,855	(17,445)
Other	(96)	(182)
Accounts payable and accrued expenses	(10,582)	18,938
Net cash provided by operating activities	58,013	35,998
Investing Activities
Capital expenditures, including purchases and development of properties	(137,517)	(60,889)
Proceeds from sale of oil and gas properties	6,389	42,144
Net cash used in investing activities	(131,128)	(18,745)
Financing Activities
Proceeds from long-term borrowings	64,000	40,000
Payments on long-term borrowings	(46,437)	(54,150)
Proceeds from Issuance of Common Stock	53,755	0
Increase (Decrease) in Deferred Charges	(946)	(100)
Exercise of stock options	255	44
Other	(28)	(141)
Net cash provided by (used in) financing activities	70,599	(14,347)
Effect of exchange rate changes on cash	(3)	18
(Decrease) increase in cash	(2,519)	2,924
Cash and equivalents, at beginning of period	5,205	2,061
Cash and equivalents, at end of period	2,686	4,985
Supplemental disclosure of cash flow information:
Interest paid	$ 1,899	$ 3,096