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Derivative Instruments and Hedging Activities - Outstanding Commodity Derivatives (Details) MMBbls in Millions, Bcf in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 $ / Mcf Bcf | Dec. 31, 2017 $ / bbl $ / Mcf MMBbls Bcf
Natural gas (Leidy) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf |  | 17.7
Natural gas (Leidy) | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf |  | 0.71
Natural gas (Transco) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf |  | 21.3
Natural gas (Transco) | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf |  | 0.42
Crude oil (WTI/LLS) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | MMBbls |  | 2.9
Crude oil (WTI/LLS) | Minimum |  |
Derivative [Line Items] |  |
Collar Ceiling Price (in usd per Mcf or usd per bbl) | $ / bbl |  | 63.35
Crude oil (WTI/LLS) | Maximum |  |
Derivative [Line Items] |  |
Collar Ceiling Price (in usd per Mcf or usd per bbl) | $ / bbl |  | 63.80
Crude oil (WTI/LLS) | Weighted Average |  |
Derivative [Line Items] |  |
Collar Floor Price (in usd per Mcf or usd per bbl) | $ / bbl |  | 55.00
Collar Ceiling Price (in usd per Mcf or usd per bbl) | $ / bbl |  | 63.62
Natural gas purchase |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf |  | 81.2
Natural gas purchase | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf |  | 3.70
Natural gas sales |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf |  | 11.7
Natural gas sales | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf |  | 4.71
Subsequent Event | Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf | 84.4 |
Subsequent Event | Natural gas (NYMEX) | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 2.93 |
Subsequent Event | Natural gas (NYMEX) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf | 13.3 |
Subsequent Event | Natural gas (NYMEX) | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 3.10 |
Subsequent Event | Natural gas (Leidy) |  |
Derivative [Line Items] |  |
Volume (in Bcf for gas and Mmbbls for oil) | Bcf | 16.2 |
Subsequent Event | Natural gas (Leidy) | Weighted Average |  |
Derivative [Line Items] |  |
Swaps Weighted Average (in usd per Mcf or usd per bbl) | $ / Mcf | 0.68 |

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