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
 1 Months Ended
Jul. 31, 2015
Jun. 30, 2015
Apr. 30, 2015
Mar. 31, 2016
Dec. 31, 2015
Mar. 27, 2015
Assets and Liabilities Measured at Fair Value            
Short-term marketable securities       $ 77,685 $ 9,014  
Investments, at fair value       484,084 439,560  
Revolving Credit Facility            
Assets and Liabilities Measured at Fair Value            
Line of Credit Facility, Maximum Borrowing Capacity           $ 234,000
Time Warner            
Assets and Liabilities Measured at Fair Value            
Investments, at fair value       $ 483,917 $ 438,912  
Written call option | Time Warner            
Assets and Liabilities Measured at Fair Value            
Class of Warrant or Right, Outstanding       0 0  
Cashless Collar            
Assets and Liabilities Measured at Fair Value            
Payments from settlements of financial instruments $ 67,100          
Cashless Collar | Time Warner            
Assets and Liabilities Measured at Fair Value            
Derivative share amount hedged           1,700,000
Total | Recurring            
Assets and Liabilities Measured at Fair Value            
Cash equivalents       $ 775,379 $ 639,956  
Short-term marketable securities       77,685 9,014  
Available for sale securities | Total | Recurring            
Assets and Liabilities Measured at Fair Value            
Investments, at fair value       484,084 $ 439,560  
Expiration Date February 2015 | Written call option | Time Warner            
Assets and Liabilities Measured at Fair Value            
Derivative share amount hedged         625,000  
Expiration Date February 2016 | Written call option | Time Warner            
Assets and Liabilities Measured at Fair Value            
Payments from settlements of financial instruments   $ 48,300        
Expiration Date May 2015 | Written call option | Time Warner            
Assets and Liabilities Measured at Fair Value            
Derivative share amount hedged         625,000  
Payments from settlements of financial instruments     $ 36,700      
Quoted prices in active markets for identical assets (Level 1) | Recurring            
Assets and Liabilities Measured at Fair Value            
Cash equivalents       775,379 $ 639,956  
Short-term marketable securities       77,685 9,014  
Quoted prices in active markets for identical assets (Level 1) | Available for sale securities | Recurring            
Assets and Liabilities Measured at Fair Value            
Investments, at fair value       $ 484,084 $ 439,560