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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2015
Debt Disclosure [Abstract] |
Schedule of Borrowing Base Utilization, Credit Facility [Table Text Block] | Interest and commitment fees are accrued based on the borrowing base utilization grid below. Eurodollar loans accrue interest at the London Interbank Offered Rate plus the applicable margin from the utilization table below, and Alternate Base Rate (“ABR”) and swingline loans accrue interest at Prime plus the applicable margin from the utilization table below. Commitment fees are accrued on the unused portion of the aggregate commitment amount and are included in interest expense in the accompanying statements of operations. Borrowing Base Utilization Grid
Borrowing Base Utilization Percentage |  | <25% |  | ≥25% <50% |  | ≥50% <75% |  | ≥75% <90% |  | ≥90%
Eurodollar Loans |  | 1.250 | % |  | 1.500 | % |  | 1.750 | % |  | 2.000 | % |  | 2.250 | %
ABR Loans or Swingline Loans |  | 0.250 | % |  | 0.500 | % |  | 0.750 | % |  | 1.000 | % |  | 1.250 | %
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, and available borrowing capacity under the Credit Agreement as of February 17, 2016, December 31, 2015, and December 31, 2014:
| As of February 17, 2016 |  | As of December 31, 2015 |  | As of December 31, 2014
| (in thousands)
Credit facility balance (1) | $ | 243,000 |  |  | $ | 202,000 |  |  | $ | 166,000 |
Letters of credit (2) | $ | 200 |  |  | $ | 200 |  |  | $ | 808 |
Available borrowing capacity | $ | 1,256,800 |  |  | $ | 1,297,800 |  |  | $ | 1,333,192 |
____________________________________________
(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 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 December 31, 2015, and 2014, consisted of the following:
| As of December 31,
| 2015 |  | 2014 (1)
| 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)
6.625% Notes due 2019 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 350,000 |  |  | $ | 4,591 |  |  | $ | 345,409 |
6.50% Notes due 2021 | 350,000 |  |  | 4,106 |  |  | 345,894 |  |  | 350,000 |  |  | 4,806 |  |  | 345,194 |
6.125% Notes due 2022 | 600,000 |  |  | 8,714 |  |  | 591,286 |  |  | 600,000 |  |  | 9,812 |  |  | 590,188 |
6.50% Notes due 2023 | 400,000 |  |  | 5,231 |  |  | 394,769 |  |  | 400,000 |  |  | 5,969 |  |  | 394,031 |
5.0% Notes due 2024 | 500,000 |  |  | 7,455 |  |  | 492,545 |  |  | 500,000 |  |  | 8,377 |  |  | 491,623 |
5.625% Notes due 2025 | 500,000 |  |  | 8,524 |  |  | 491,476 |  |  | — |  |  | — |  |  | — |
Total | $ | 2,350,000 |  |  | $ | 34,030 |  |  | $ | 2,315,970 |  |  | $ | 2,200,000 |  |  | $ | 33,555 |  |  | $ | 2,166,445 |
____________________________________________
(1) | Prior period amounts have been reclassified to conform to the current period presentation on the accompanying balance sheets. Please refer to the section Recently Issued Accounting Standards in Note 1 – Summary of Significant Accounting Policies for additional discussion.

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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=34725769&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=6451184&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=6451184&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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