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DIVIDENDS (Details)	0 Months Ended	6 Months Ended
	May 14, 2013	Jun. 30, 2014	Apr. 19, 2013
DIVIDENDS
Percentage of dividend declared on common stock		0.00%	5.00%
Percentage of dividend paid on common stock	5.00%	0.00%

X

- Definition

Represents the percentage of dividend declared on outstanding common shares.

+ References

No definition available.

+ Details

Name:	tge_CommonStockDividendsDeclaredPercentage
Namespace Prefix:	tge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of dividend paid on outstanding common shares.

+ References

No definition available.

+ Details

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

X

- Details

Name:	tge_DividendsDisclosureAbstract
Namespace Prefix:	tge_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration