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Depreciation and Amortization (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization $ 72,995 $ 72,410 $ 145,368 $ 146,283
Direct advertising expenses [Member]
        
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization 68,708 68,675 136,943 138,246
General and administrative expenses [Member]
        
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization 1,046 1,059 2,022 2,070
Corporate expenses [Member]
        
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization $ 3,241 $ 2,676 $ 6,403 $ 5,967