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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%
Percentage of participant's contribution matched by 50% of employer contribution	6.00%
Matching contribution to the plan	$ 158,000	$ 113,000	$ 98,000

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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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

X

- 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

+ Details

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Balance Type:	debit
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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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Namespace Prefix:	us-gaap_
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