Revolving Credit Facility - Narrative (Details)	Oct. 21, 2020 USD ($)	Oct. 31, 2021 USD ($)	Oct. 21, 2021 USD ($)	Sep. 30, 2021 USD ($)	Aug. 31, 2021 USD ($)	Mar. 05, 2021 USD ($)	Sep. 30, 2020 USD ($)	May 07, 2020 USD ($)	Oct. 15, 2019 USD ($)	Sep. 28, 2017 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings				$ 60,000,000			$ 101,000,000
Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing base				$ 135,000,000	$ 132,500,000	$ 135,000,000		$ 150,000,000	$ 180,000,000	$ 25,000,000
Maximum facility amount										$ 500,000,000
Accordion feature, increase limit									$ 200,000,000
Total commitments						$ 135,000,000
Leverage ratio for restricted payments, maximum	2.75
Cash balance threshold, prepayment of lines of credit	$ 15,000,000
Cash balance threshold, borrowing base	10.00%
Cash balance threshold, number of consecutive business days exceeded	5 years
Hedging requirement ratio, minimum				0.50
Weighted average interest rate				2.83%			4.09%
Available under the credit facility				$ 75,000,000			$ 31,500,000
Line of Credit | Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Borrowing base		$ 175,000,000	$ 175,000,000
Total commitments			$ 175,000,000
Line of Credit | Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Leverage ratio	1.0
Line of Credit | Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Leverage ratio	3.5
Line of Credit | Revolving Credit Facility | Eurodollar Loan | London Interbank Offered Rate (LIBOR) | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Line of Credit | Revolving Credit Facility | Eurodollar Loan | London Interbank Offered Rate (LIBOR) | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.50%
Line of Credit | Revolving Credit Facility | Base Rate Loan | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Unused capacity, commitment fee percentage	0.375%
Line of Credit | Revolving Credit Facility | Base Rate Loan | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.50%
Unused capacity, commitment fee percentage	0.50%
Line of Credit | Revolving Credit Facility | Base Rate Loan | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Line of Credit | Revolving Credit Facility | Base Rate Loan | Fed Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%