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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Major Customers [Table Text Block] | The Company had the following major customers and sales to entities under common ownership, which accounted for 10 percent or more of its total oil, gas, and NGL production revenue for at least one of the periods presented:
| For the Years Ended December 31,
| 2018 |  | 2017 |  | 2016
Major customer #1 (1) | 18 | % |  | 6 | % |  | — | %
Major customer #2 (1) | 10 | % |  | 10 | % |  | 5 | %
Group #1 of entities under common ownership (2) | 18 | % |  | 17 | % |  | 15 | %
Group #2 of entities under common ownership (2) | 12 | % |  | 8 | % |  | 8 | %
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(1) | These major customers are purchasers of a portion of the Company’s production from its Permian region.
(2) | In the aggregate, these groups of entities under common ownership represented more than 10 percent of total oil, gas, and NGL production revenue for at least one of the periods presented; however, no individual entity comprising either group represented more than 10 percent of the Company’s total oil, gas, and NGL production revenue.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The accompanying statements of operations line items that were adjusted as a result of the adoption of ASU 2017-07 for the years ended December 31, 2017, and 2016 are summarized as follows:
| For the Year Ended December 31, 2017 |  | For the Year Ended December 31, 2016
| As Reported |  | As Adjusted |  | As Reported |  | As Adjusted
| (in thousands)
Operating expenses: |  |  |  |  |  |  |
Exploration | $ | 56,179 |  |  | $ | 54,713 |  |  | $ | 65,641 |  |  | $ | 64,970 |
General and administrative | $ | 120,585 |  |  | $ | 117,283 |  |  | $ | 126,428 |  |  | $ | 124,828 |
Total operating expenses | $ | 1,297,865 |  |  | $ | 1,293,097 |  |  | $ | 2,276,765 |  |  | $ | 2,274,494 |
Income (loss) from operations | $ | (168,489 | ) |  | $ | (163,721 | ) |  | $ | (1,059,315 | ) |  | $ | (1,057,044 | )
Other non-operating income (expense), net | $ | 3,968 |  |  | $ | (800 | ) |  | $ | 362 |  |  | $ | (1,909 | )

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109236672&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22580-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=109236672&loc=d3e725-108305 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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