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Investment in Global - Market Value of Investment in Global (Details)
$ in Thousands
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2015
£ / shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2014
£ / shares
Investments, Debt and Equity Securities [Abstract]        
Shares of Global Stock Held by HKN 12,805,000   12,805,000  
Closing Price of Global Stock | £ / shares   £ .35   £ .50
Foreign Currency Exchange Rate 1.5725   1.5586  
Market Value of Investment in Global | $ $ 6,947   $ 9,979