XML 54 R28.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Derivative financial instruments (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative activity by volume | The following table sets forth the Company’s outstanding commodity derivative contracts as of December 31, 2023.
| 2024 |  | 2025
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total |  | Total
Collar (oil) |  |  |  |  |  |  |  |  |  |  |
Volume (Bbl) | 461,524 |  | 401,874 |  | 361,552 |  | 311,496 |  | 1,536,446 |  | 273,000
Weighted-average floor price ($/Bbl) | $ | 64.22 |  |  | $ | 64.27 |  |  | $ | 64.32 |  |  | $ | 64.13 |  |  | $ | 64.24 |  |  | $ | 63.00 |
Weighted-average ceiling price ($/Bbl) | $ | 84.99 |  |  | $ | 85.11 |  |  | $ | 85.24 |  |  | $ | 84.97 |  |  | $ | 85.07 |  |  | $ | 82.70 |
Swaps (oil) |  |  |  |  |  |  |  |  |  |  |
Volume (Bbl) | 62,000 |  | 48,000 |  | 39,000 |  | 32,000 |  | 181,000 |  | —
Weighted-average price ($/Bbl) | $ | 80.00 |  |  | $ | 80.00 |  |  | $ | 80.00 |  |  | $ | 80.00 |  |  | $ | 80.00 |  |  | $ | — |
Collar (natural gas) |  |  |  |  |  |  |  |  |  |  |
Volume (Mcf) | 3,856,000 |  | — |  | — |  | 1,615,000 |  | 5,471,000 |  | 2,156,000
Weighted-average floor price ($/Mcf) | $ | 2.93 |  |  | $ | — |  |  | $ | — |  |  | $ | 3.57 |  |  | $ | 3.12 |  |  | $ | 3.57 |
Weighted-average ceiling price ($/Mcf) | $ | 4.39 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.37 |  |  | $ | 4.68 |  |  | $ | 5.37 |
Swaps (natural gas) |  |  |  |  |  |  |  |  |  |  |
Volume (Mcf) | — |  | 3,236,000 |  | 2,823,000 |  | 844,000 |  | 6,903,000 |  | 450,000
Weighted-average price ($/Mcf) | $ | — |  |  | $ | 3.22 |  |  | $ | 3.22 |  |  | $ | 3.22 |  |  | $ | 3.22 |  |  | $ | 3.68 |
Schedule of commodity derivatives reported in earnings | The following table summarizes the amounts reported in the consolidated statements of operations related to the commodity derivative instruments for the years ended December 31, 2023, 2022 and 2021:
| Year Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Gain (loss) on commodity derivatives |  |  |  |  |
Oil derivatives | $ | 6,459 |  |  | $ | (14,985) |  |  | $ | (24,885) |
Natural gas derivatives | 19,085 |  |  | (10,339) |  |  | (7,504) |
Total | $ | 25,544 |  |  | $ | (25,324) |  |  | $ | (32,389) |
Schedule of net cash receipts (payments on) commodity derivatives | The following table represents the Company’s net cash receipts (payments on) commodity derivatives for the years ended December 31, 2023, 2022 and 2021:
| Year Ended December 31,
(in thousands) | 2023 |  | 2022 |  | 2021
Net cash receipts from (payments on) commodity derivatives |  |  |  |  |
Oil derivatives | $ | 4,576 |  |  | $ | (23,695) |  |  | $ | (19,034) |
Natural gas derivatives | 18,319 |  |  | (18,742) |  |  | (6,185) |
Total | $ | 22,895 |  |  | $ | (42,437) |  |  | $ | (25,219) |

X
- Definition Tabular disclosure of the net cash receipts (payments on) commodity derivative instruments. + References No definition available. + Details
Name: | grnt_ScheduleOfNetCashReceiptsPaymentsOnCommodityDerivativesTableTextBlock
Namespace Prefix: | grnt_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 815 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1B Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-8 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-5 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C + Details
Name: | us-gaap_ScheduleOfDerivativeInstrumentsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration