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401(k)PLAN (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
401(k) PLAN
Eligible age of employees to participate in the contribution plan	20 years 6 months
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%
Percentage of participant's contribution matched by 50% of employer contribution	6.00%
Matching contribution to the plan	$ 113,000	$ 98,000	$ 79,000

X

- Definition

Represents the minimum period of service required for eligibility to participate in the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	tge_
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Balance Type:	na
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X

- Definition

Represents the eligible age of employees to participate in the defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	tge_
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Balance Type:	na
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X

- 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

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Namespace Prefix:	tge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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