XML 60 R49.htm IDEA: XBRL DOCUMENT
v3.21.2

FRESH START ACCOUNTING (Reorganization Adjustment to Long-term Debt) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | May 17, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Reorganization, Chapter 11 [Line Items] |  |  |
Current maturities of long-term debt | $ 60,000 | $ 60,000 | $ 253,743
Long-term debt, net of current maturities | $ 689,502 | 792,751 | $ 0
Current portion of Term Notes issued under the Exit Facility |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Current maturities of long-term debt |  | 60,000 |
Payment of DIP Facility to effectuate Exit Facility |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Current maturities of long-term debt |  | (157,500) |
Transfer of post-petition RBL borrowings to Exit Facility |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Current maturities of long-term debt |  | (122,751) |
Emergence Date draw on Exit Facility |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Long-term debt, net of current maturities |  | 122,751 |
Noncurrent portion of First-Out Term Loan issued under the Exit Credit Facility |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Long-term debt, net of current maturities |  | 120,000 |
Issuance of Successor Senior Notes |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Long-term debt, net of current maturities |  | 550,000 |
Reorganization Adjustments |  |  |
Reorganization, Chapter 11 [Line Items] |  |  |
Current maturities of long-term debt |  | (220,251) |
Long-term debt, net of current maturities |  | $ 792,751 |

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ReorganizationChapter11LineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentCurrentPortionOfTermNotesIssuedUnderTheExitFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentPaymentOfDIPFacilityToEffectuateExitFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentTransferOfPostPetitionRBLBorrowingsToExitFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentEmergenceDateDrawOnExitFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentNoncurrentPortionOfFirstOutTermNotesIssuedUnderTheExitCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=gpor_ReorganizationChapter11PlanEffectAdjustmentIssuanceOfSuccessorSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FreshStartAdjustmentsTypeOfFreshStartAdjustmentAxis=us-gaap_ReorganizationChapter11PlanEffectAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |