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 ($)
Sep. 30, 2016
Dec. 31, 2015
Available-for-sale securities    
Investments in available-for-sale securities   $ 439,560,000
Unrealized Holding Gains and Losses    
Gross unrealized holding gains $ 0 357,000
Gross unrealized holding losses $ 0 0
Other equity securities    
Available-for-sale securities    
Investments in available-for-sale securities   648,000
Time Warner Cable    
Available-for-sale securities    
Investments in available-for-sale securities   $ 438,912,000