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INCOME TAXES (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current:              
U.S. federal           $ 3,947,400us-gaap_CurrentFederalTaxExpenseBenefit $ 35,561us-gaap_CurrentFederalTaxExpenseBenefit
Foreign         949,207us-gaap_CurrentForeignTaxExpenseBenefit 5,313,874us-gaap_CurrentForeignTaxExpenseBenefit 3,343,374us-gaap_CurrentForeignTaxExpenseBenefit
State and local         205,997us-gaap_CurrentStateAndLocalTaxExpenseBenefit 264,269us-gaap_CurrentStateAndLocalTaxExpenseBenefit 698,362us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current income tax expense (benefit)         1,155,204us-gaap_CurrentIncomeTaxExpenseBenefit 9,525,543us-gaap_CurrentIncomeTaxExpenseBenefit 4,077,297us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred expense (benefit)     (3,565,623)us-gaap_DeferredIncomeTaxExpenseBenefit (2,792,520)us-gaap_DeferredIncomeTaxExpenseBenefit (3,308,713)us-gaap_DeferredIncomeTaxExpenseBenefit 359,535us-gaap_DeferredIncomeTaxExpenseBenefit 2,469,953us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit): (2,112,616)us-gaap_IncomeTaxExpenseBenefit (2,150,433)us-gaap_IncomeTaxExpenseBenefit (1,954,251)us-gaap_IncomeTaxExpenseBenefit 158,537us-gaap_IncomeTaxExpenseBenefit (2,153,509)us-gaap_IncomeTaxExpenseBenefit 9,885,078us-gaap_IncomeTaxExpenseBenefit 6,547,250us-gaap_IncomeTaxExpenseBenefit
Components of income before income tax attributable to Operations              
Components of income (loss) before income tax attributable to domestic operations         (12,635,002)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 6,018,971us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic 6,085,192us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Components of income (loss) before income tax attributable to foreign operations         4,165,452us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 19,537,986us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 11,295,273us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Federal income tax rate (as a percent)         34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Reconciliation of income tax expense (provision)              
Computed expected tax expense         (2,879,647)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 8,944,935us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,909,358us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in income taxes resulting from:              
Change in effective rates used for deferred taxes             (503,693)tge_IncomeTaxReconciliationDeferredTaxRateDifferential
Nondeductible expenses and other         590,180tge_IncomeTaxReconciliationNondeductibleExpenseAndOther 768,652tge_IncomeTaxReconciliationNondeductibleExpenseAndOther 534,742tge_IncomeTaxReconciliationNondeductibleExpenseAndOther
State and local taxes, net of federal benefit         135,958us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 171,491us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 606,843us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Income tax expense (benefit): (2,112,616)us-gaap_IncomeTaxExpenseBenefit (2,150,433)us-gaap_IncomeTaxExpenseBenefit (1,954,251)us-gaap_IncomeTaxExpenseBenefit 158,537us-gaap_IncomeTaxExpenseBenefit (2,153,509)us-gaap_IncomeTaxExpenseBenefit 9,885,078us-gaap_IncomeTaxExpenseBenefit 6,547,250us-gaap_IncomeTaxExpenseBenefit
Deferred tax assets              
Foreign tax credits         244,898us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign 473,405us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Net operating loss carry forwards         61,139us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 462,548us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Other         88,911us-gaap_DeferredTaxAssetsOther 92,983us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets         394,948us-gaap_DeferredTaxAssetsNet 1,028,936us-gaap_DeferredTaxAssetsNet  
Deferred tax liability              
Property, equipment, and intangible asset         (4,985,687)tge_DeferredTaxLiabilitiesPropertyEquipmentAndIntangibleAsset (8,646,047)tge_DeferredTaxLiabilitiesPropertyEquipmentAndIntangibleAsset  
Total         (4,590,739)us-gaap_DeferredTaxAssetsLiabilitiesNet (7,617,111)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Classification of net deferred tax components              
Noncurrent (liabilities)         (4,590,739)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent (7,617,111)us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent  
Total         (4,590,739)us-gaap_DeferredTaxAssetsLiabilitiesNet (7,617,111)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Net operating loss carry forwards for U.S. federal income tax purposes         180,000us-gaap_OperatingLossCarryforwards    
Unrecognized tax benefits         $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits