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SHARE-BASED COMPENSATION (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 item | Sep. 30, 2013 | Sep. 30, 2014 item | Sep. 30, 2013 | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
Allocation of stock-based compensation cost |  |  |  |  |  |  |
Compensation expense per share (in dollars per share) |  |  | $ 0.02 tge_AllocatedShareBasedCompensationExpensePerShare | $ 0.04 tge_AllocatedShareBasedCompensationExpensePerShare |  |  |
Recognized stock-based compensation expense | $ 164,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 158,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 544,000 us-gaap_AllocatedShareBasedCompensationExpense | $ 817,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |
Unrecognized compensation expense related to share-based compensation plans | $ 488,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  | $ 488,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  | $ 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | $ 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | $ 0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Number of stock-based compensation plans | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  |
Period over which unrecognized compensation expense is expected to be recognized |  |  | 3 years |  |  |  |
Maximum |  |  |  |  |  |  |
Allocation of stock-based compensation cost |  |  |  |  |  |  |
Compensation expense per share (in dollars per share) | $ 0.01 tge_AllocatedShareBasedCompensationExpensePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 0.01 tge_AllocatedShareBasedCompensationExpensePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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- Definition Represents the expense recognized during the period, per share, arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The number of share-based compensation plans approved by the entity's shareholders. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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