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, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Noncurrent $ 340,826,000 $ 326,700,000
Unrealized Holding Gains and Losses    
Gross unrealized holding gains 1,200,000 5,900,000
Gross unrealized holding losses 0 0
Other equity securities
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Noncurrent 1,479,000 6,248,000
Time Warner
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Noncurrent $ 339,347,000 $ 320,452,000