DIVIDENDS (Details)	0 Months Ended	9 Months Ended	12 Months Ended
May 14, 2013	May 14, 2012	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 19, 2013
DIVIDENDS
Percentage of dividend declared on common stock			0.00%			5.00%
Percentage of dividend paid on common stock	5.00%tge_CommonStockDividendsPaidPercentage	5.00%tge_CommonStockDividendsPaidPercentage	0.00%tge_CommonStockDividendsPaidPercentage	5.00%tge_CommonStockDividendsPaidPercentage	5.00%tge_CommonStockDividendsPaidPercentage

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