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Depreciation and Amortization (Details) (USD $)
In Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization $ 72,410 $ 78,165 $ 146,283 $ 156,507
Direct Advertising Expense [Member]
       
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization 68,675 74,476 138,246 149,116
General and Administrative Expense [Member]
       
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization 1,059 1,250 2,070 2,516
Corporate Expenses [Member]
       
Depreciation and amortization expenses excluded from operating expenses        
Depreciation and amortization $ 2,676 $ 2,439 $ 5,967 $ 4,875