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
Sep. 30, 2015
Dec. 31, 2014
Available-for-sale securities    
Investments in available-for-sale securities $ 424,570 $ 360,762
Unrealized Holding Gains and Losses    
Gross unrealized holding gains 41 820
Gross unrealized holding losses 0 0
Other equity securities    
Available-for-sale securities    
Investments in available-for-sale securities 368 1,147
Time Warner    
Available-for-sale securities    
Investments in available-for-sale securities $ 424,202 $ 359,615