Assets Held for Sale and Discontinued Operations - Summary of Assets and Liabilities Held for Sale (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets held for sale	$ 2,294
Total noncurrent assets held for sale	8,514
Total current liabilities associated with assets held for sale	8,212
Total noncurrent liabilities associated with assets held for sale	6,639
Assets Held for Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable	1,797
Other current assets	497
Total current assets held for sale	2,294
Proved oil and gas properties, net	8,270
Other noncurrent assets	244
Total noncurrent assets held for sale	8,514
Accounts payable	2,583
Accrued liabilities	5,312
Other current liabilities	317
Total current liabilities associated with assets held for sale	8,212
Asset retirement obligations	6,029
Other liabilities	610
Total noncurrent liabilities associated with assets held for sale	$ 6,639