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Divestitures and Assets Held for Sale (Details) - USD ($) $ in Thousands			1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 12, 2018	Jul. 10, 2018	Jul. 31, 2018	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of properties					$ 2,236	$ 4,000
Foreman Butte Divestiture [Member] | Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss recorded				$ 383,400
Net book value of assets held for sale				131,576	131,576
Net book value of liabilities held for sale				2,576	2,576
Williston Non-Op Divestiture [Member] | Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net book value of assets held for sale				118,542	118,542
Net book value of liabilities held for sale				$ 1,605	$ 1,605
Subsequent Event [Member] | 2018 Divestitures [Member] | Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of properties			$ 282,500
Subsequent Event [Member] | Williston Non-Op Divestiture [Member] | Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of properties	$ 55,000
Net gain on sale of properties		$ 33,200
Net book value of assets held for sale	33,900
Net book value of liabilities held for sale	$ 400

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