Assets Held for Sale and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	$ 2,474
Total noncurrent assets held for sale	8,748
Accrued liabilities	3,500
Total current liabilities associated with assets held for sale	4,843
Total noncurrent liabilities associated with assets held for sale	6,772
Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	1,582
Other current assets	892
Total current assets held for sale	2,474
Proved oil and gas properties, net	8,540
Other noncurrent assets	208
Total noncurrent assets held for sale	8,748
Accounts payable	2,685
Accrued liabilities	1,619
Other current liabilities	539
Total current liabilities associated with assets held for sale	4,843
Asset retirement obligations	6,191
Other liabilities	581
Total noncurrent liabilities associated with assets held for sale	$ 6,772