Quarterly report pursuant to Section 13 or 15(d)

Investments in Available-for-Sale Securities (Details)

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Investments in Available-for-Sale Securities (Details) - USD ($)
$ in Thousands, shares in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2015
Apr. 30, 2015
Jun. 30, 2015
Mar. 27, 2015
Dec. 31, 2014
Available-for-sale securities          
Investments in available-for-sale securities $ 421,914   $ 421,914   $ 360,762
Borrowings of debt     40,000    
Unrealized Holding Gains and Losses          
Gross unrealized holding gains 223   223   820
Gross unrealized holding losses 0   0   0
Other equity securities          
Available-for-sale securities          
Investments in available-for-sale securities 550   550   1,147
Time Warner          
Available-for-sale securities          
Investments in available-for-sale securities $ 421,364   $ 421,364   $ 359,615
Time Warner | Cashless Collar          
Available-for-sale securities          
Derivative share amount hedged       1.7  
Revolving Credit Facility          
Available-for-sale securities          
Maximum borrowing capacity       $ 234,000  
Revolving Credit Facility | Time Warner          
Available-for-sale securities          
Number of common shares pledged as collateral 1.7        
Borrowings of debt   $ 40,000