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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)			$ 0.02tge_AllocatedShareBasedCompensationExpensePerShare	$ 0.04tge_AllocatedShareBasedCompensationExpensePerShare
Recognized stock-based compensation expense	$ 164,000us-gaap_AllocatedShareBasedCompensationExpense	$ 158,000us-gaap_AllocatedShareBasedCompensationExpense	$ 544,000us-gaap_AllocatedShareBasedCompensationExpense	$ 817,000us-gaap_AllocatedShareBasedCompensationExpense
Unrecognized compensation expense related to share-based compensation plans	$ 488,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized		$ 488,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized		$ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	$ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	$ 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Number of stock-based compensation plans	2tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans		2tge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPlans		2tge_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)	$ 0.01tge_AllocatedShareBasedCompensationExpensePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 0.01tge_AllocatedShareBasedCompensationExpensePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- 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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X

- Definition

The number of share-based compensation plans approved by the entity's shareholders.

+ References

No definition available.

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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

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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

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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

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