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401(k) PLAN (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
401(k) PLAN |  |  |
Eligible age of employees to participate in the contribution plan | 21 years |  |
Required service period to participate in the contribution plan | 1 year |  |
Employer matching contribution of the first 6% of participant's contribution (as a percent) | 50.00%tge_DefinedContributionPlanEmployerMatchingContributionRate |  |
Percentage of participant's contribution matched by 50% of employer contribution | 6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent |  |
Matching contribution to the plan | $ 158,000 us-gaap_DefinedContributionPlanCostRecognized | $ 113,000 us-gaap_DefinedContributionPlanCostRecognized | $ 98,000 us-gaap_DefinedContributionPlanCostRecognized

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- Definition Represents the minimum period of service required for eligibility to participate in the defined contribution plan. + References No definition available. + Details
Name: | tge_DefinedContributionPlanEligiblePeriodOfServiceForParticipation
Namespace Prefix: | tge_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the eligible age of employees to participate in the defined contribution plan. + References No definition available. + Details
Name: | tge_DefinedContributionPlanEmployeeEligibilityAge
Namespace Prefix: | tge_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The rate at which the employer matches the specified percentage of employees' gross pay under a defined contribution plan. + References No definition available. + Details
Name: | tge_DefinedContributionPlanEmployerMatchingContributionRate
Namespace Prefix: | tge_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration