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Derivative Instruments - Narrative (Details) BTU in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) BTU | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Credit facility, face amount |  |  |  |  |  |  | $ 400,000,000
Cash received (paid) in settlement of commodity derivative instruments |  |  | $ (131,091,000) | $ 90,310,000 | $ (139,045,000) | $ 383,727,000 |
Interest Rate Swap on Line of Credit | Long |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Put option, basis points (as a percent) | 0.25% |  |  |  |  |  |
Interest Rate Swap on Revolving Credit Facility | Long |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Put option, basis points (as a percent) | 0.00% |  |  |  |  |  |
Term of derivative contract | 4 years |  |  |  |  |  |
Derivative notional amount | $ 250,000,000 |  |  |  |  |  | $ 250,000,000
NYMEX Commodity Swaps | Natural Gas |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash received (paid) in settlement of commodity derivative instruments |  |  |  |  |  | 54,982,000 |
NYMEX Natural Gas Hedges | Natural Gas |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash received (paid) in settlement of commodity derivative instruments |  |  |  |  |  | $ 5,851,000 |
Quantity of natural gas contract terminated (in mmbtus) | BTU |  |  |  |  |  | 8 |
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 |  |  |  |  |
Credit facility, modification period |  | 3 years |  |  |  |  |

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