Supplemental Disclosures (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental disclosures of cash flow information
Cash paid for interest expense, net of amounts capitalized	$ 1,269	$ 1,359
asset retirement obligations related to mineral properties	1,715	626
Asset retirement obligations related to support equipment and facilities	111	30
(Decrease) increase in liabilities for oil and natural gas properties capital expenditures	42,012	(15,590)
(Decrease) increase in liabilities for support equipment and facilities	437	(1,065)
Issuance of restricted stock units for Board and advisor services	96	47
Issuance of common stock for advisor services	6	8
Stock based compensation expense recognized as liability	677	30
Transfer of inventory to oil and natural gas properties	$ 107	$ 211