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Divestitures and Assets Held for Sale - Schedule of Assets and Liabilities Held for Sale (Details) - Held for Sale [Member] $ in Thousands	Jun. 30, 2018 USD ($)
Williston Non-Op Divestiture [Member]
Assets:
Accounts receivable, net	$ 273
Oil and gas properties (successful efforts method)	179,921
Less: accumulated depreciation, depletion, amortization and impairment	(61,652)
Total assets held for sale, net	118,542
Liabilities:
Asset retirement obligations	1,605
Total liabilities held for sale	1,605
Foreman Butte Divestiture [Member]
Assets:
Accounts receivable, net	601
Inventory	866
Oil and gas properties (successful efforts method)	336,604
Other property and equipment	11,865
Less: accumulated depreciation, depletion, amortization and impairment	(218,360)
Total assets held for sale, net	131,576
Liabilities:
Asset retirement obligations	2,576
Total liabilities held for sale	$ 2,576

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