| **Derivative Instruments and Hedging Activities - Derivative Instruments Summary (Details)** | Dec. 31, 2017 bbl / d MMBTU / d $ / MMBTU $ / bbl |
|----------------------------------------------------------------------------------------------|---------------------------------------------------|
| Crude Oil Commodity Contract | Three Way Collars - NYMEX WTI 2018                            |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 10,000                                            |
| Weighted Average Short Put Price                                                             | 45.50                                             |
| Weighted Average Floor Price                                                                 | 52.50                                             |
| Weighted Average Ceiling Price                                                               | 69.09                                             |
| Crude Oil Commodity Contract | Swaps - NYMEX WTI 2018                                        |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 24,000                                            |
| Weighted Average Fixed Price                                                                 | 57.09                                             |
| Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2018                              |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 18,000                                            |
| Weighted Average Floor Price                                                                 | 50.42                                             |
| Weighted Average Ceiling Price                                                               | 58.82                                             |
| Crude Oil Commodity Contract | Three Way Collars - Dated Brent 2018                          |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 3,000                                             |
| Weighted Average Short Put Price                                                             | 40.00                                             |
| Weighted Average Floor Price                                                                 | 50.00                                             |
| Weighted Average Ceiling Price                                                               | 70.41                                             |
| Crude Oil Commodity Contract | Swaps - ICE Brent 2018                                        |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 2,000                                             |
| Weighted Average Fixed Price                                                                 | 59.00                                             |
| Crude Oil Commodity Contract | Two Way Collars - ICE Brent 2018                              |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 2,000                                             |
| Weighted Average Floor Price                                                                 | 50.00                                             |
| Weighted Average Ceiling Price                                                               | 55.25                                             |
| Crude Oil Commodity Contract | Three Way Collars - ICE Brent 2018                            |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 5,000                                             |
| Weighted Average Short Put Price                                                             | 43.00                                             |
| Weighted Average Floor Price                                                                 | 50.00                                             |
| Weighted Average Ceiling Price                                                               | 59.50                                             |
| Crude Oil Commodity Contract | Basic Swap 2018                                               |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 12,000                                            |
| Weighted Average Fixed Price                                                                 | (0.60)                                            |
| Crude Oil Commodity Contract | Swaps - NYMEX WTI 2019                                        |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 3,000                                             |
| Weighted Average Fixed Price                                                                 | 55.07                                             |
| Crude Oil Commodity Contract | Swaps - ICE Brent 2019                                        |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 5,000                                             |
| Weighted Average Fixed Price                                                                 | 57.00                                             |
| Crude Oil Commodity Contract | Three Way Collar - ICE Brent 2019                             |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 3,000                                             |
| Weighted Average Short Put Price                                                             | 43.00                                             |
| Weighted Average Floor Price                                                                 | 50.00                                             |
| Weighted Average Ceiling Price                                                               | 64.07                                             |
| Crude Oil Commodity Contract | Basic Swap 2019                                               |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | bbl / d                                                                     | 12,000                                            |
| Weighted Average Fixed Price                                                                 | (1.01)                                            |
| Natural Gas Commodity Contract | Three Way Collars - NYMEX HH 2018                           |                                              |
| **Derivative [Line Items]**                                                                  |                                              |
| Volume Per Day | MMBTU / d                                                                   | 120,000                                           |
| Weighted Average Short Put Price | $ / MMBTU                                                 | 2.50                                              |
| Weighted Average Floor Price | $ / MMBTU                                                     | 2.88                                              |
| Weighted Average Ceiling Price | $ / MMBTU                                                   | 3.65                                              |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B
+ Details**Name:**invest_DerivativeNonmonetaryNotionalAmount**Namespace Prefix:**invest_**Data Type:**xbrli:decimalItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                 |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.
+ References
No definition available.
+ Details**Name:**us-gaap_DerivativeAverageCapPrice**Namespace Prefix:**us-gaap_**Data Type:**us-types:perUnitItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.
+ References
No definition available.
+ Details**Name:**us-gaap_DerivativeAverageFloorPrice**Namespace Prefix:**us-gaap_**Data Type:**us-types:perUnitItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                               |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The average strike price on the group of price risk option contracts such as put options or call options.
+ References
No definition available.
+ Details**Name:**us-gaap_DerivativeAveragePriceRiskOptionStrikePrice**Namespace Prefix:**us-gaap_**Data Type:**us-types:perUnitItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ Details**Name:**us-gaap_DerivativeLineItems**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Average fixed price related to the group of price risk swap derivatives.
+ References
No definition available.
+ Details**Name:**us-gaap_DerivativeSwapTypeAverageFixedPrice**Namespace Prefix:**us-gaap_**Data Type:**us-types:perUnitItemType**Balance Type:**na**Period Type:**instant |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                        |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                 |
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| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                      |
|--------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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