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
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 636,548 $ 620,359 $ 606,625
Less: accumulated depreciation and amortization (425,948) (409,253) (401,133)
Total property and equipment, net 210,600 211,106 205,492
Capitalized software      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 268,032 252,741 238,511
Computer and broadcast equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 86,214 91,119 93,066
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 118,792 113,731 109,640
Furniture and other equipment      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 131,133 124,518 97,913
Projects in progress      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross 21,784 27,666 56,860
Land and land improvements      
Property, Plant and Equipment [Line Items]      
Property, Plant and Equipment, Gross $ 10,593 $ 10,584 $ 10,635