| **Fair Value of Financial Instruments Fair Value Measurements and Disclosures (Details) - USD ($) $ in Thousands**                                | 12 Months Ended |           |
|---------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|-----------|
||
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | $ 57,525        | $ 33,086  |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | 327,818         | 400,431   |   |   |
| Derivative, Fair Value, Net                                                                                                                       | (270,293)       |      |   |   |
| Derivative Financial Instrument Net Assets [Member]                                                                                               |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Changes in unrealized gains (losses) relating to assets (liabilities) still held as of period end, included in statement of operations line item; | (31,367)        | (35,108)  | $ 0 |   |
| Fair Value, Measured With Unobservable Input Reconcilition, Recurring Basis, Net Asset Value                                                      | (35,990)        | (62,540)  | (8,427) |   |
| Derivative Financial Instruments, Assets                                                                                                          |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Fair Value, Measured With Unobservable Input Reconcilition, Recurring Basis, Net Asset Value                                                      |            | (62,540)  | (8,427) | $ 8,414 |
| Commodity Price Risk Management, net | Derivative Financial Instrument Net Assets [Member]                                                        |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Changes in unrealized gains (losses) relating to assets (liabilities) still held as of period end, included in statement of operations line item; | (31,367)        | (35,108)  | 0 |   |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Assets, Gain (Loss) Included in Earnings                    | (192,694)       | (206,109) | 37,821 |   |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset, Purchases, Sales, Issues, Settlements                | 241,960         | 151,996   | $ (54,662) |   |
| Fair Value                                                                                                                                        |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 57,525          | 33,086    |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (327,818)       | (400,431) |   |   |
| Fair Value | Non Current Liabilities [Member]                                                                                                     |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (53,600)        | (95,561)  |   |   |
| Fair Value | Non Current Assets [Member]                                                                                                          |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 25,562          | 15,177    |   |   |
| Fair Value | Current Assets [Member]                                                                                                              |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 31,963          | 17,909    |   |   |
| Fair Value | Current Liabilities [Member]                                                                                                         |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (274,218)       | (304,870) |   |   |
| Fair Value | Significant Other Observable Inputs (Level 2)                                                                                        |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 29,617          | 605       |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (263,920)       | (305,410) |   |   |
| Fair Value | Significant Other Observable Inputs (Level 2) | Non Current Liabilities [Member]                                                     |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (49,749)        | (74,715)  |   |   |
| Fair Value | Significant Other Observable Inputs (Level 2) | Non Current Assets [Member]                                                          |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 20,439          | 605       |   |   |
| Fair Value | Significant Other Observable Inputs (Level 2) | Current Assets [Member]                                                              |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 9,178           | 0         |   |   |
| Fair Value | Significant Other Observable Inputs (Level 2) | Current Liabilities [Member]                                                         |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (214,171)       | (230,695) |   |   |
| Fair Value | Significant Unobservable Inputs (Level 3)                                                                                            |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 27,908          | 32,481    |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (63,898)        | (95,021)  |   |   |
| Fair Value | Significant Unobservable Inputs (Level 3) | Non Current Liabilities [Member]                                                         |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (3,851)         | (20,846)  |   |   |
| Fair Value | Significant Unobservable Inputs (Level 3) | Non Current Assets [Member]                                                              |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 5,123           | 14,572    |   |   |
| Fair Value | Significant Unobservable Inputs (Level 3) | Current Assets [Member]                                                                  |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Asset, Fair Value, Gross Asset                                                                                                         | 22,785          | 17,909    |   |   |
| Fair Value | Significant Unobservable Inputs (Level 3) | Current Liabilities [Member]                                                             |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Derivative Liability, Fair Value, Gross Liability                                                                                                 | (60,047)        | (74,175)  |   |   |
| 6.125% Senior Notes due 2024 [Member]                                                                                                             |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Notes fair value                                                                                                                                  | $ 198,400       | $ 202,800 |   |   |
| Senior Notes Percent of Par                                                                                                                       | 99.20%          | 101.40%   |   |   |
| 5.75% Senior Notes due 2026 [Member]                                                                                                              |            |      |   |   |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]**                                                  |            |      |   |   |
| Notes fair value                                                                                                                                  | $ 716,000       | $ 775,500 |   |   |
| Senior Notes Percent of Par                                                                                                                       | 95.50%          | 103.40%   |   |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset, Period Increase (Decrease).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents net assets measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of purchases, sales, issues, and settlements (net) which have taken place in relation to net assets measured at fair value on a recurring basis using unobservable inputs (level 3).
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Description of where the gain (loss), arising from net assets measured at fair value on a recurring basis using unobservable inputs (level 3), is to be recognized in earnings.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the fair value Senior Notes, as a percentage of par value, as of the balance sheet date.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of the assets less the liabilities of a derivative or group of derivatives.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value portion of notes payable.
+ References
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