XML 23 R25.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Property And Equipment (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2014
Property, Plant and Equipment [Abstract] |
Schedule Of Property And Equipment | The major categories of property and equipment and related accumulated depletion, depreciation, amortization and impairment as of September 30, 2014 and December 31, 2013 are as follows:
| September 30, 2014 |  | December 31, 2013
| (In thousands)
Oil and natural gas properties | $ | 3,586,016 |  |  | $ | 2,477,178 |
Office furniture and fixtures | 9,741 |  |  | 6,093 |
Building | 4,942 |  |  | 4,626 |
Land | 2,197 |  |  | 412 |
Total property and equipment | 3,602,896 |  |  | 2,488,309 |
Accumulated depletion, depreciation, amortization and impairment | (969,962 | ) |  | (784,717 | )
Property and equipment, net | $ | 2,632,934 |  |  | $ | 1,703,592 |
Summary Of Oil And Gas Properties Not Subject To Amortization | The following table summarizes the Company’s non-producing properties excluded from amortization by area at September 30, 2014:
| September 30, 2014
| (In thousands)
Colorado | $ | 5,842 |
Bakken | 295 |
Southern Louisiana | 708 |
Ohio | 1,445,840 |
Other | 45 |
| $ | 1,452,730 |
Schedule Of Asset Retirement Obligation | A reconciliation of the Company's asset retirement obligation for the nine months ended September 30, 2014 and 2013 is as follows:
| September 30, 2014 |  | September 30, 2013
| (In thousands)
Asset retirement obligation, beginning of period | $ | 15,083 |  |  | $ | 13,275 |
Liabilities incurred | 5,713 |  |  | 1,771 |
Liabilities settled | (4,972 | ) |  | (807 | )
Accretion expense | 569 |  |  | 529 |
Asset retirement obligation as of end of period | 16,393 |  |  | 14,768 |
Less current portion | 75 |  |  | 780 |
Asset retirement obligation, long-term | $ | 16,318 |  |  | $ | 13,988 |

X
- Definition Tabular disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + References No definition available. + Details
Name: | gpor_ScheduleOfPropertyAndEquipmentTableTextBlock
Namespace Prefix: | gpor_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the capitalized costs of unproved properties and major development projects that are excluded from capitalized costs being amortized. This includes the total costs excluded and, at a minimum, these categories of costs: acquisition costs, exploration costs, development costs in the case of significant development projects, and capitalized interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 3(ii)(A) -Article 4 + Details
Name: | us-gaap_ScheduleOfCapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration