Business Combination (Details) - HEYCO $ in Thousands	Feb. 27, 2015 USD ($) a shares	Sep. 30, 2015 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Oil and natural gas producing properties and undeveloped acreage | a	58,600
Net acreage acquired | a	18,200
Consideration for the business combination	$ 33,600
Shares of common stock converted for each share of Series A Preferred Stock | shares	10
Additional amount paid for customary purchase price adjustments	$ 3,000
Deferred tax liabilities assumed	75,966
Liabilities assumed in business combination	$ 4,600
Transaction costs incurred		$ 2,500
Common Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Shares issued as consideration in business combination | shares	3,300,000
Preferred Stock
Business Acquisition, Equity Interests Issued or Issuable [Line Items]
Shares issued as consideration in business combination | shares	150,000