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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES:    
Net (loss) income $ (347) $ 1,714
Adjustments to reconcile net income to cash provided by operating activities:    
Depletion, depreciation and amortization 17,056 11,030
Unrealized loss on commodity derivatives 4,100 2,672
Exploration expense 260 1,287
Share-based compensation expense 2,257 2,232
Deferred income (benefit) tax (187) 982
Equity in losses of investee 116  
Changes in operating assets and liabilities:    
Accounts receivable 2,548 (599)
Prepaid expenses and other assets (297) (296)
Accounts payable 5,955 (1,855)
Oil, NGL and gas sales payable (123) (397)
Accrued liabilities (1,700) 18,721
Cash provided by operating activities 29,638 35,491
INVESTING ACTIVITIES:    
Additions to oil and gas properties (69,455) (77,608)
Contribution to equity method investment (6,280)  
Additions to furniture, fixtures and equipment, net (251) (57)
Cash used in investing activities (75,986) (77,665)
FINANCING ACTIVITIES:    
Borrowings under credit facility, net of debt issuance costs 79,975 60,650
Repayment of amounts outstanding under credit facility (33,800) (19,100)
Proceeds from issuance of common stock upon exercise of stock options   798
Cash provided by financing activities 46,175 42,348
CHANGE IN CASH AND CASH EQUIVALENTS (173) 174
CASH AND CASH EQUIVALENTS, beginning of period 767 301
CASH AND CASH EQUIVALENTS, end of period 594 475
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest $ 806 $ 643