Consolidated Statements of Operations and Retained Earnings (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUE AND OTHER INCOME
Oil and natural gas sales	$ 559,398us-gaap_OilAndGasSalesRevenue	$ 646,955us-gaap_OilAndGasSalesRevenue	$ 503,467us-gaap_OilAndGasSalesRevenue
Interest income	2,856us-gaap_InterestIncomeOperating	2,174us-gaap_InterestIncomeOperating	1,709us-gaap_InterestIncomeOperating
Total revenue and other income	562,254gte_TotalRevenueAndOtherIncome	649,129gte_TotalRevenueAndOtherIncome	505,176gte_TotalRevenueAndOtherIncome
EXPENSES
Operating	113,949us-gaap_OperatingCostsAndExpenses	110,172us-gaap_OperatingCostsAndExpenses	92,207us-gaap_OperatingCostsAndExpenses
Depletion, depreciation, accretion and impairment	451,003	202,851	150,570
General and administrative	51,249us-gaap_GeneralAndAdministrativeExpense	41,115us-gaap_GeneralAndAdministrativeExpense	46,659us-gaap_GeneralAndAdministrativeExpense
Financial instruments loss	4,722	0	0
Other loss	0us-gaap_OtherOperatingIncomeExpenseNet	4,400us-gaap_OtherOperatingIncomeExpenseNet	0us-gaap_OtherOperatingIncomeExpenseNet
Other gain	(2,000)us-gaap_OtherNonoperatingIncomeExpense	0us-gaap_OtherNonoperatingIncomeExpense	(9,336)us-gaap_OtherNonoperatingIncomeExpense
Foreign exchange (gain) loss	(39,535)	(18,693)	28,727
Total expenses	579,388us-gaap_CostsAndExpenses	339,845us-gaap_CostsAndExpenses	308,827us-gaap_CostsAndExpenses
(LOSS) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	(17,134)	309,284	196,349
Income tax expense	(127,215)us-gaap_IncomeTaxExpenseBenefit	(128,261)us-gaap_IncomeTaxExpenseBenefit	(96,267)us-gaap_IncomeTaxExpenseBenefit
(Loss) Income from Continuing Operations Attributable to Parent	(144,349)	181,023	100,082
Loss from discontinued operations, net of income taxes	(26,990)	(54,735)	(423)
NET INCOME (LOSS) AND COMPREHENSIVE INCOME (LOSS)	(171,339)us-gaap_NetIncomeLoss	126,288us-gaap_NetIncomeLoss	99,659us-gaap_NetIncomeLoss
RETAINED EARNINGS, BEGINNING OF YEAR	410,961	284,673	185,014
RETAINED EARNINGS, END OF YEAR	$ 239,622	$ 410,961	$ 284,673
BASIC
INCOME (LOSS) FROM CONTINUING OPERATIONS (in dollars per share)	$ (0.51)	$ 0.64	$ 0.35
LOSS FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES (in dollars per share)	$ (0.09)	$ (0.19)	$ 0.00
NET INCOME (LOSS) (in dollars per share)	$ (0.60)us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic
DILUTED
INCOME (LOSS) FROM CONTINUING OPERATIONS (in dollars per share)	$ (0.51)	$ 0.63	$ 0.35
LOSS FROM DISCONTINUED OPERATIONS, NET OF INCOME TAXES (in dollars per share)	$ (0.09)	$ (0.19)	$ 0.00
NET INCOME (LOSS) (in dollars per share)	$ (0.60)us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted
WEIGHTED AVERAGE SHARES OUTSTANDING - BASIC	284,715,785	282,808,497	280,741,255
WEIGHTED AVERAGE SHARES OUTSTANDING - DILUTED	284,715,785	286,127,897	284,172,254

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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense.

+ References

No definition available.

+ Details

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

+ References

No definition available.

+ Details

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- Definition

Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 23

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447

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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 31

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.31(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

+ Details

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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