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

Represents the percentage of dividend declared on outstanding common shares.

No definition available.

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