Quarterly report pursuant to Section 13 or 15(d)

Property And Equipment (Schedule Of Property And Equipment) (Details)

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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 646,038 $ 620,359 $ 618,162
Less: accumulated depreciation and amortization (433,890) (409,253) (410,946)
Total property and equipment, net 212,148 211,106 207,216
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 270,385 252,741 248,389
Computer and broadcast equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 86,162 91,119 98,842
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 127,949 113,731 110,711
Furniture and other equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 131,196 124,518 123,799
Projects in progress      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 19,753 27,666 25,806
Land and land improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 10,593 $ 10,584 $ 10,615