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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Basis of Presentation and Significant Accounting Policies [Abstract] |
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block] | The Company had the following major customer and sales to entities under common ownership, which accounted for 10 percent or more of its total oil, natural gas, and NGL production revenue for at least one of the periods presented:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Major customer (1) | 18 | % |  | 21 | % |  | 19 | %
Group #1 of entities under common ownership (2) | 15 | % |  | 10 | % |  | 14 | %
Group #2 of entities under common ownership (2) | 8 | % |  | 11 | % |  | 9 | %
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(1) | This major customer is the operator of the Company’s outside-operated Eagle Ford shale program, in which the Company entered into various marketing agreements with during 2013, whereby the Company is subject to certain gathering, transportation, and processing throughput commitments for up to 10 years pursuant to each contract. Because the Company shares with its operator the risk of non-performance by its counterparty purchasers, the Company has included its operator as a major customer in the table above. Several of the operator’s counterparty purchasers under these contracts are also direct purchasers of the Company’s production from other areas. As of December 31, 2016, the Company’s outside-operated Eagle Ford shale assets were classified as held for sale.
(2) | In the aggregate these groups of entities under common ownership represent more than 10 percent of total production revenue for the period(s) shown, however, none of the entities comprising either group individually represented more than 10 percent of the Company’s production revenue.
Dilutive and Anti-Dilutive Shares for Earnings per Share [Table Text Block] | The following table details the weighted-average dilutive and anti-dilutive securities for the years presented:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands)
Dilutive | — |  |  | — |  |  | 814 |
Anti-dilutive | 280 |  |  | 256 |  |  | — |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the calculations of basic and diluted earnings per share:
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
| (in thousands, except per share amounts)
Net income (loss) | $ | (757,744 | ) |  | $ | (447,710 | ) |  | $ | 666,051 |
Basic weighted-average common shares outstanding | 76,568 |  |  | 67,723 |  |  | 67,230 |
Add: dilutive effect of unvested RSUs, contingent PSUs, and stock options (1) | — |  |  | — |  |  | 814 |
Add: dilutive effect of 1.50% Senior Convertible Notes (2) | — |  |  | — |  |  | — |
Diluted weighted-average common shares outstanding | 76,568 |  |  | 67,723 |  |  | 68,044 |
Basic net income (loss) per common share | $ | (9.90 | ) |  | $ | (6.61 | ) |  | $ | 9.91 |
Diluted net income (loss) per common share | $ | (9.90 | ) |  | $ | (6.61 | ) |  | $ | 9.79 |
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(1) | For the years ended December 31, 2016, and 2015, the shares were anti-dilutive and excluded from the calculation of diluted earnings per share.
(2) | For the year ended December 31, 2016, shares of the Company’s common stock traded at an average closing price below the $40.50 conversion price, and therefore, had no dilutive impact and were excluded from the calculation of diluted earnings per share.
Comprehensive Income (Loss) [Table Text Block] | The changes in the balances of components comprising other comprehensive income (loss) are presented in the following table:
| Pension Liability Adjustments
| (in thousands)
For the year ended December 31, 2014 |
Net actuarial loss | $ | (10,062 | )
Reclassification to earnings | 706 |
Tax benefit | 3,460 |
Loss, net of tax | $ | (5,896 | )
For the year ended December 31, 2015 |
Net actuarial loss | $ | (4,990 | )
Reclassification to earnings | 1,853 |
Tax benefit | 1,047 |
Loss, net of tax | $ | (2,090 | )
For the year ended December 31, 2016 |
Net actuarial loss | $ | (3,322 | )
Reclassification to earnings | 1,598 |
Tax benefit | 570 |
Loss, net of tax | $ | (1,154 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e526-108580 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -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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