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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
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May 14, 2013 | May 14, 2012 | 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 |  |  |  |  |  |  |  |  |
Number of stock-based compensation plans |  |  | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  | 2 tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans |  |
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 |  |  |
Fair value of option |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  | 117,611 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 143,602 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 109,347 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Risk-free interest rate (as a percent) |  |  |  |  |  |  |  |  | 0.40%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Expected dividend yields (as a percent) |  |  |  |  |  |  |  |  | 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Expected life of option |  |  |  |  |  |  |  |  | 5 years
Expected volatility (as a percent) |  |  |  |  |  |  |  |  | 61.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Earnings Per Share |  |  |  |  |  |  |  |  |
Percentage of dividend paid on common stock | 5.00%tge_CommonStockDividendsPaidPercentage | 5.00%tge_CommonStockDividendsPaidPercentage |  |  | 0.00%tge_CommonStockDividendsPaidPercentage |  | 5.00%tge_CommonStockDividendsPaidPercentage | 5.00%tge_CommonStockDividendsPaidPercentage |
Unvested stock options |  |  |  |  |  |  |  |  |
Allocation of stock-based compensation cost |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  |  |  |  |  | 206,952 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 283,950 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 230,167 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Fair value of option |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |
Restricted stock |  |  |  |  |  |  |  |  |
Allocation of stock-based compensation cost |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  |  |  |  |  | 492,692 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 317,109 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 28,603 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Represents the percentage of dividend paid on outstanding common shares. + 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 The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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