Annual report pursuant to Section 13 and 15(d)

Assets and Liabilities Measured at Fair Value (Details)

v3.3.1.900
Assets and Liabilities Measured at Fair Value (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jul. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Apr. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
$ / item
shares
Dec. 31, 2013
USD ($)
Mar. 27, 2015
USD ($)
$ / item
shares
Feb. 28, 2015
$ / item
shares
Assets and Liabilities Measured at Fair Value                
Short-term marketable securities       $ 9,014 $ 9,001      
Investments, at fair value       439,560 360,762      
Payments from settlements of financial instruments       182,192 130,237 $ 63,547    
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       $ 438,912 359,615      
Written call option | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative share amount hedged | shares       0        
Cashless Collar | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative share amount hedged | shares             1,700,000  
Payments from settlements of financial instruments $ 67,100              
Cashless Collar | Put Option | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative, Price Risk Option Strike Price | $ / item             136.80  
Cashless Collar | Call Option | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative, Price Risk Option Strike Price | $ / item             161.62  
Total | Recurring                
Assets and Liabilities Measured at Fair Value                
Cash equivalents       $ 639,956 36,002      
Short-term marketable securities       9,014 9,001      
Available for sale securities | Total | Recurring                
Assets and Liabilities Measured at Fair Value                
Investments, at fair value       439,560 360,762      
Available for sale securities | Total | Written call option | Recurring | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative liabilities, at fair value         $ (75,356)      
Expiration Date February 2015 | Written call option | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative share amount hedged | shares         625,000      
Derivative, Price Risk Option Strike Price | $ / item         92.02      
Expiration Date February 2016 | Written call option | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative share amount hedged | shares               625,000
Derivative, Price Risk Option Strike Price | $ / item               100.39
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 | shares         625,000      
Derivative, Price Risk Option Strike Price | $ / item         90.84      
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       639,956        
Short-term marketable securities       9,014        
Quoted prices in active markets for identical assets (Level 1) | Available for sale securities | Recurring                
Assets and Liabilities Measured at Fair Value                
Cash equivalents         $ 36,002      
Short-term marketable securities         9,001      
Investments, at fair value       $ 439,560 360,762      
Level 2 | Available for sale securities | Written call option | Recurring | Time Warner                
Assets and Liabilities Measured at Fair Value                
Derivative liabilities, at fair value         $ (75,356)      
Minimum | Time Warner                
Level 2 input                
Volatility       11.70%        
Interest rate       0.23%        
Dividend yield       0.00%        
Maximum | Time Warner                
Level 2 input                
Volatility       29.10%        
Interest rate       0.99%        
Dividend yield       1.71%