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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2016
Debt Disclosure [Abstract] |
Schedule of Borrowing Base Utilization, Credit Facility [Table Text Block] | Effective as of April 8, 2016, the revised borrowing base utilization grid under the Amended Credit Agreement is as follows: Borrowing Base Utilization Grid
Borrowing Base Utilization Percentage |  | <25% |  | ≥25% <50% |  | ≥50% <75% |  | ≥75% <90% |  | ≥90%
Eurodollar Loans |  | 1.750 | % |  | 2.000 | % |  | 2.250 | % |  | 2.500 | % |  | 2.750 | %
ABR Loans or Swingline Loans |  | 0.750 | % |  | 1.000 | % |  | 1.250 | % |  | 1.500 | % |  | 1.750 | %
Commitment Fee Rate |  | 0.300 | % |  | 0.300 | % |  | 0.350 | % |  | 0.375 | % |  | 0.375 | %
Schedule of Line of Credit Facilities [Table Text Block] | The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Amended Credit Agreement as of July 27, 2016, and June 30, 2016, and under the Credit Agreement as of December 31, 2015:
| As of July 27, 2016 |  | As of June 30, 2016 |  | As of December 31, 2015
| (in thousands)
Credit facility balance (1) | $ | 330,000 |  |  | $ | 330,500 |  |  | $ | 202,000 |
Letters of credit (2) | $ | 200 |  |  | $ | 200 |  |  | $ | 200 |
Available borrowing capacity | $ | 919,800 |  |  | $ | 919,300 |  |  | $ | 1,297,800 |
____________________________________________ (1) Deferred financing costs attributable to the credit facility are presented as a component of other noncurrent assets on the accompanying balance sheets and thus are not deducted from the credit facility balance. (2) Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.
Schedule of Long-term Debt Instruments [Table Text Block] | The Senior Notes, net of unamortized deferred financing costs line on the accompanying balance sheets as of June 30, 2016, and December 31, 2015, consisted of the following:
| As of June 30, 2016 |  | As of December 31, 2015
| Senior Notes |  | Unamortized Deferred Financing Costs |  | Senior Notes, Net of Unamortized Deferred Financing Costs |  | Senior Notes |  | Unamortized Deferred Financing Costs |  | Senior Notes, Net of Unamortized Deferred Financing Costs
| (in thousands)
6.50% Senior Notes due 2021 | $ | 346,955 |  |  | $ | 3,721 |  |  | $ | 343,234 |  |  | $ | 350,000 |  |  | $ | 4,106 |  |  | $ | 345,894 |
6.125% Senior Notes due 2022 | 561,796 |  |  | 7,569 |  |  | 554,227 |  |  | 600,000 |  |  | 8,714 |  |  | 591,286 |
6.50% Senior Notes due 2023 | 394,985 |  |  | 4,801 |  |  | 390,184 |  |  | 400,000 |  |  | 5,231 |  |  | 394,769 |
5.0% Senior Notes due 2024 | 500,000 |  |  | 6,994 |  |  | 493,006 |  |  | 500,000 |  |  | 7,455 |  |  | 492,545 |
5.625% Senior Notes due 2025 | 500,000 |  |  | 8,071 |  |  | 491,929 |  |  | 500,000 |  |  | 8,524 |  |  | 491,476 |
Total | $ | 2,303,736 |  |  | $ | 31,156 |  |  | $ | 2,272,580 |  |  | $ | 2,350,000 |  |  | $ | 34,030 |  |  | $ | 2,315,970 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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