Business Combination Details 1 (Details) - HEYCO $ in Thousands	Feb. 27, 2015 USD ($)
Business Acquisition [Line Items]
Cash	$ 24,648
Total consideration given	128,616
Cash acquired	620
Accounts receivable	3,536
Inventory	180
Other current assets	106
Evaluated oil and natural gas properties	16,524
Unproved oil and unevaluated natural gas properties	201,521
Other property and equipment	178
Accounts payable	(2,551)
Accrued liabilities	(1,504)
Current note payable	(11,982)
Asset retirement obligations	(2,046)
Deferred tax liabilities incurred	(75,966)
Net assets acquired	128,616
Preferred Stock
Business Acquisition [Line Items]
Preferred and common shares issued	32,490
Common Stock
Business Acquisition [Line Items]
Preferred and common shares issued	$ 71,478