Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities Measured at Fair Value (Details)

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Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses) $ (23,116) $ (12,532) $ (12,091) $ 23,745
Charter | Warrants        
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses)   (7,976)   15,233
Time Warner | Investment and financial instruments [member]        
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses) $ (23,116) $ (4,556) $ (12,091) $ 8,512