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Derivative Instruments - Narrative (Details) - USD ($)	1 Months Ended		3 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Derivative [Line Items]
Cash received (paid) in settlement of commodity derivative instruments			$ 2,405,000	$ 151,161,000
Interest Rate Swap on Line of Credit | Long
Derivative [Line Items]
Put option, basis points (as a percent)	0.25%			0.25%
Interest Rate Swap on Revolving Credit Facility | Long
Derivative [Line Items]
Put option, basis points (as a percent)	0.00%			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
Line of Credit
Derivative [Line Items]
Credit facility, face amount	$ 175,000,000			$ 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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- Definition

Debt Instrument, Modification Period

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

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-Section 55
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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

+ References

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
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