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Subsequent Events (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 13, 2016
Jun. 30, 2016
Jun. 30, 2015
Subsequent Event [Line Items]      
Capital contribution from non-controlling interest holder   $ 0 $ 15,000
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Ownership percentage after additional interest holder contributions 51.00%    
Capital contribution from non-controlling interest holder $ 168,000    
Subsequent Event [Member] | ATV Joint Venture [Member] | Verizon [Member]      
Subsequent Event [Line Items]      
Interest acquired 24.50%    
Purchase price $ 159,000    
Subsequent Event [Member] | ATV Joint Venture [Member] | Hearst Corporation [Member]      
Subsequent Event [Line Items]      
Interest acquired 24.50%