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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses) $ 1,370 $ 47,985 $ 2,351 $ 92,990
Zero-strike call option        
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses) $ 1,370   $ 2,351  
Time Warner Cable | Investment and financial instruments [member]        
Realized and Unrealized Gains (Losses) on Financial Instruments        
Realized and unrealized gains (losses)   $ 47,985   $ 92,990