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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) | 0 Months Ended | 9 Months Ended | 12 Months Ended
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May 14, 2013 | May 14, 2012 | Sep. 30, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY |  |  |  |  |
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

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- 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

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