Supplemental Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Supplemental disclosures of cash flow information
Cash paid for interest expense, net of amounts capitalized	$ 2,110	$ 442
Asset retirement obligations related to mineral properties	889	405
Asset retirement obligations related to support equipment and facilities	4	54
(Decrease) increase in liabilities for oil and natural gas properties capital expenditures	(6,288)	19,067
(Decrease) increase in liabilities for support equipment and facilities	(1,100)	482
(Decrease) increase in liabilities for accrued cost to issue equity	456	(332)
Issuance of restricted stock units for Board and advisor services	186	34
Issuance of common stock for advisor services	25	71
Stock based compensation expense recognized as liability	715	(930)
Transfer of inventory to oil and natural gas properties	$ 201	$ (91)