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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
Major customer #1 (1) | 10 | % |  | 5 | % |  | 4 | %
Major customer #2 (2) | 7 | % |  | 18 | % |  | 21 | %
Group #1 of entities under common ownership (3) | 17 | % |  | 15 | % |  | 10 | %
Group #2 of entities under common ownership (3) | 8 | % |  | 8 | % |  | 11 | %
____________________________________________
(1) | This major customer is a purchaser of the Company’s production from its Permian region.
(2) | This major customer was the operator of the Company’s outside-operated Eagle Ford shale program, which was divested of during the first quarter of 2017. Prior to the divestiture, the Company was party to various marketing agreements, which included certain gathering, transportation, and processing throughput commitments. Because the Company shared with the operator the risk of non-performance by its counterparty purchasers, the Company included the operator as a major customer in the table above. Several of the operator’s counterparty purchasers under these contracts were also direct purchasers of the Company’s production from other areas.
(3) | In the aggregate these groups of entities under common ownership represent more than 10 percent of total oil, gas, and NGL production revenue for the period(s) shown, however, none of the individual entities comprising either group represented more than 10 percent of the Company’s total oil, gas, and NGL production revenue.
Schedule of Weighted-Average Anti-Dilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following table details the weighted-average anti-dilutive securities for the years presented:
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Anti-dilutive | 264 |  |  | 280 |  |  | 256 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the calculations of basic and diluted net loss per common share:
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands, except per share data)
Net loss | $ | (160,843 | ) |  | $ | (757,744 | ) |  | $ | (447,710 | )
Basic weighted-average common shares outstanding | 111,428 |  |  | 76,568 |  |  | 67,723 |
Add: dilutive effect of non-vested RSUs and contingent PSUs | — |  |  | — |  |  | — |
Add: dilutive effect of Senior Convertible Notes | — |  |  | — |  |  | — |
Diluted weighted-average common shares outstanding | 111,428 |  |  | 76,568 |  |  | 67,723 |
Basic net loss per common share | $ | (1.44 | ) |  | $ | (9.90 | ) |  | $ | (6.61 | )
Diluted net loss per common share | $ | (1.44 | ) |  | $ | (9.90 | ) |  | $ | (6.61 | )
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The December 31, 2016, and 2015 accompanying statements of cash flows line items that were adjusted as a result of the adoption of ASU 2016-15 and ASU 2016-18 are summarized as follows:
| For the Years Ended December 31,
| 2016 |  | 2015
| As Reported |  | As Adjusted |  | As Reported |  | As Adjusted
| (in thousands)
Non-cash (gain) loss on extinguishment of debt | $ | (15,722 | ) |  | N/A |  |  | $ | 4,123 |  |  | N/A |
(Gain) loss on extinguishment of debt | N/A |  |  | $ | (15,722 | ) |  | N/A |  |  | $ | 16,578 |
Net cash provided by operating activities | $ | 552,804 |  |  | $ | 552,804 |  |  | $ | 978,352 |  |  | $ | 990,807 |
Other, net | $ | (3,000 | ) |  | $ | — |  |  | $ | (985 | ) |  | $ | (985 | )
Net cash used in investing activities | $ | (1,870,639 | ) |  | $ | (1,867,639 | ) |  | $ | (1,144,639 | ) |  | $ | (1,144,639 | )
Cash paid for extinguishment of debt | N/A |  |  | $ | — |  |  | N/A |  |  | $ | (12,455 | )
Net cash provided by financing activities | $ | 1,327,189 |  |  | $ | 1,327,189 |  |  | $ | 166,185 |  |  | $ | 153,730 |
Net change in cash and cash equivalents | $ | 9,354 |  |  | N/A |  |  | $ | (102 | ) |  | N/A |
Net change in cash, cash equivalents, and restricted cash | N/A |  |  | $ | 12,354 |  |  | N/A |  |  | $ | (102 | )
Cash and cash equivalents at beginning of period | $ | 18 |  |  | N/A |  |  | $ | 120 |  |  | N/A |
Cash, cash equivalents, and restricted cash at beginning of period | N/A |  |  | $ | 18 |  |  | N/A |  |  | $ | 120 |
Cash and cash equivalents at end of period | $ | 9,372 |  |  | N/A |  |  | $ | 18 |  |  | N/A |
Cash, cash equivalents, and restricted cash at end of period | N/A |  |  | $ | 12,372 |  |  | N/A |  |  | $ | 18 |
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the accompanying balance sheets to the amounts shown in the accompanying statements of cash flows:
| December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Cash and cash equivalents | $ | 313,943 |  |  | $ | 9,372 |  |  | $ | 18 |
Restricted cash (1) | — |  |  | 3,000 |  |  | — |
Total cash, cash equivalents, and restricted cash shown in the accompanying statements of cash flows | $ | 313,943 |  |  | $ | 12,372 |  |  | $ | 18 |
____________________________________________
(1) | Restricted cash is included in other noncurrent assets on the accompanying balance sheets.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + 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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