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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 ($) | Sep. 28, 2017 USD ($)
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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% |  |  |  |  |  |  |  |  |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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