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Derivative Instruments - Narrative (Details) MMBTU in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MMBTU | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MMBTU | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Apr. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash received (paid) in settlement of commodity derivative instruments |  |  | $ 90,310,000 | $ 57,041,000 | $ 383,727,000 | $ 26,331,000 |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative notional amount |  |  | $ 575,625,000 |  | 575,625,000 |  | $ 160,000,000 |
Interest Rate Swap on Revolving Credit Facility | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Term of derivative contract | 4 years |  |  |  |  |  |  |
Put option | 0.00% |  |  |  |  |  |  |
Derivative notional amount | $ 250,000,000 |  |  |  |  |  |  |
Interest Rate Swap on Line of Credit | Long |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Put option | 0.25% |  |  |  |  |  |  |
NYMEX Natural Gas Hedges | Natural Gas |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash received (paid) in settlement of commodity derivative instruments |  |  |  |  | $ 5,851,000 |  |  |
Nonmonetary notional amount | MMBTU |  |  | 8 |  | 8 |  |  |
NYMEX Commodity Swaps | Natural Gas |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Cash received (paid) in settlement of commodity derivative instruments |  |  |  |  | $ 54,982,000 |  |  |
Line of Credit |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Credit facility, face amount | $ 175,000,000 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Credit facility, face amount |  | $ 160,000,000 |  |  |  |  |  | $ 2,100,000,000
Credit facility, modification period |  | 3 years |  |  |  |  |  |

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