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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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