Supplemental Disclosures (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental disclosures of cash flow information
Cash paid for interest expense, net of amounts capitalized	$ 16,154	$ 5,269	$ 5,801
Asset retirement obligations related to mineral properties	2,510	3,843	1,363
Asset retirement obligations related to support equipment and facilities	383	120	3
(Decrease) increase in liabilities for oil and natural gas properties capital expenditures	(30,683)	32,972	7,458
Increase in liabilities for support equipment and facilities	12,076	4,290	660
Issuance of restricted stock units for Board and advisor services	584	444	274
Issuance of common stock for Board and advisor services	24	16	57
Stock-based compensation expense recognized as liability	79	223	1,012
Transfer of inventory to oil and natural gas properties	$ 615	$ 216	$ 343