Supplemental Disclosures (Details 1) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental disclosures of cash flow information
Cash paid for interest expense, net of amounts capitalized	$ 13,370	$ 2,617
Asset retirement obligations related to mineral properties	2,588	1,487
Asset retirement obligations related to support equipment and facilities	644	89
(Decrease) increase in liabilities for oil and natural gas properties capital expenditures	(7,849)	(30,282)
(Decrease) increase in liabilities for support equipment and facilities	(2,687)	2,525
Stock-based compensation expense recognized as liability	457	191
Transfer of inventory from oil and natural gas properties	$ 655	$ 586