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Debt - Additional Information (Details) - Credit Facility - Revolving Credit Facility | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Debt Instrument |  |
Maximum borrowing capacity | $ 75,000,000.0 | $ 75,000,000.0
Debt outstanding | 12,000,000.0 | 12,000,000.0
Outstanding letters of credit | 4,300,000 | 4,300,000
Borrowing base | $ 58,700,000 | $ 58,700,000
Commitment fee |  | 0.50%
Average interest rate during period | 2.90% | 3.20%
Percentage of proved reserves pledged as collateral | 85.00% | 85.00%
Total net leverage ratio (no greater than) | 3.50 | 3.50
Interest coverage ratio (no less than) | 2.25 | 2.25
Leverage ratio | (0.01) | (0.01)
Coverage ratio | 27.13 | 27.13
Minimum | LIBOR |  |
Debt Instrument |  |
Basis spread on variable rate |  | 2.00%
Minimum | Base Rate |  |
Debt Instrument |  |
Basis spread on variable rate |  | 1.00%
Maximum | LIBOR |  |
Debt Instrument |  |
Basis spread on variable rate |  | 3.00%
Maximum | Base Rate |  |
Debt Instrument |  |
Basis spread on variable rate |  | 2.00%

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: 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 + Details
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