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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2014
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 Long-term Debt Instruments [Table Text Block] | The following table presents the outstanding balance, total amount of letters of credit, and available borrowing capacity under the Company's credit facility as of February 18, 2015, December 31, 2014, and December 31, 2013:
| As of February 18, 2015 |  | As of December 31, 2014 |  | As of December 31, 2013
| (in thousands)
Credit facility balance | $ | 341,000 |  |  | $ | 166,000 |  |  | $ | — |
Letters of credit (1) | $ | 808 |  |  | $ | 808 |  |  | $ | 808 |
Available borrowing capacity | $ | 1,158,192 |  |  | $ | 1,333,192 |  |  | $ | 1,299,192 |
____________________________________________ (1) Letters of credit reduce the amount available under the credit facility on a dollar-for-dollar basis.
Schedule of Long-Term Debt [Table Text Block] | The Senior Notes line on the accompanying balance sheets, as of December 31, 2014, and 2013, consisted of the following:
| As of December 31,
| 2014 |  | 2013
| (in thousands)
2019 Notes | $ | 350,000 |  |  | $ | 350,000 |
2021 Notes | 350,000 |  |  | 350,000 |
2022 Notes | 600,000 |  |  | — |
2023 Notes | 400,000 |  |  | 400,000 |
2024 Notes | 500,000 |  |  | 500,000 |
Total Senior Notes | $ | 2,200,000 |  |  | $ | 1,600,000 |
Schedule of Debt Instrument Redemption Price, 6.125% Senior Notes Due 2022 [Table Text Block] | On or after November 15, 2018, the Company may also redeem all or, from time to time, a portion of the 2022 Notes at the redemption prices set forth below, during the twelve-month period beginning on November 15 of each applicable year, expressed as a percentage of the principal amount redeemed, plus accrued and unpaid interest:
2018 | 103.063 | %
2019 | 101.531 | %
2020 and thereafter | 100.000 | %
Schedule of Debt Instrument Redemption Price, 5% Senior Notes Due 2024 [Table Text Block] | On or after July 15, 2018, the Company may also redeem all or, from time to time, a portion of the 2024 Notes at the redemption prices set forth below, during the twelve-month period beginning on July 15 of each applicable year, expressed as a percentage of the principal amount redeemed, plus accrued and unpaid interest:
2018 | 102.500 | %
2019 | 101.677 | %
2020 | 100.833 | %
2021 and thereafter | 100.000 | %
Schedule of Debt Instrument Redemption Price, 6.50% Senior Notes Due 2023 [Table Text Block] | On or after July 1, 2017, the Company may also redeem all or, from time to time, a portion of the 2023 Notes at the redemption prices set forth below, during the twelve-month period beginning on July 1 of each applicable year, expressed as a percentage of the principal amount redeemed, plus accrued and unpaid interest:
2017 | 103.250 | %
2018 | 102.167 | %
2019 | 101.083 | %
2020 and thereafter | 100.000 | %
Schedule of Debt Instrument, Redemption Price, 6.50% Senior Notes Due 2021 [Table Text Block] | The Company may also redeem all or, from time to time, a portion of the 2021 Notes on or after November 15, 2016, at the prices set forth below, during the twelve-month period beginning on November 15 of the applicable year, expressed as a percentage of the principal amount redeemed, plus accrued and unpaid interest:
2016 | 103.250 | %
2017 | 102.167 | %
2018 | 101.083 | %
2019 and thereafter | 100.000 | %
Schedule of Debt Instrument, Redemption Price, 6.625% Senior Notes Due 2019 [Table Text Block] | The Company may redeem all or, from time to time, a portion of the 2019 Notes on or after February 15, 2015, at the prices set forth in the table below, during the twelve-month period beginning on February 15 of the applicable year, expressed as a percentage of the principal amount redeemed, plus accrued and unpaid interest:
2015 | 103.313 | %
2016 | 101.656 | %
2017 and thereafter | 100.000 | %

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