Acquisitions and Divestitures (Details) - USD ($) $ in Thousands	1 Months Ended		6 Months Ended
	Dec. 31, 2016	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Apr. 17, 2017	Apr. 20, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale of oil and gas properties		$ 7,000	$ 2,207	$ 24,909
Required purchase price of the non-producing assets if agreement not reached	$ 5,000
Woodford Shale assets (East Hoss Assets)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of a majority of interests						$ 18,000
Interests In East Lake Verret Field
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of a majority of interests					$ 2,200