Supplemental Disclosures (Tables)

9 Months Ended

Sep. 30, 2012

Supplemental Disclosures [Abstract]

Summary of current accrued liabilities

	September 30, 2012		December 31, 2011
Accrued evaluated and unproved and unevaluated property costs	$	39,813	$	18,185
Accrued support equipment and facilities costs		590		216
Accrued cost to issue equity		—		332
Accrued stock-based compensation		586		2,860
Accrued lease operating expenses		4,506		575
Accrued interest on borrowings under Credit Agreement		43		—
Accrued asset retirement obligations		347		334
Other		4,377		2,937
Total accrued liabilities	$	50,262	$	25,439

Supplemental disclosures of cash flow information

	Nine Months  Ended September 30,
	2012			2011
Cash paid for interest expense, net of amounts capitalized	$	442		$	201
Asset retirement obligations related to mineral properties		405			437
Asset retirement obligations related to support equipment and facilities		54			15
Increase (decrease) in liabilities for oil and natural gas properties capital expenditures		19,067			(3,638	)
Increase in liabilities for support equipment and facilities		482			112
Issuance of restricted stock units for Board and advisor services		34			—
Issuance of common stock for Board and advisor services		71			125
Decrease in liabilities for accrued cost to issue equity		(332	)		(173	)
Stock-based compensation expense recognized as liability		(930	)		1,254
Transfer of costs to support equipment and facilities from oil and natural gas properties capital expenditures		—			129
Transfer of inventory from oil and natural gas properties		(91	)		(313	)