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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical)	0 Months Ended		12 Months Ended
	May 14, 2013	May 14, 2012	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
Percentage of dividend paid on common stock	5.00%	5.00%	5.00%	5.00%

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:	us-gaap_StatementOfStockholdersEquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration