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Accrued Expenses and Other Current Liabilities (Schedule of Accrued Expenses and Other Current Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued compensation and employee benefits $ 130,835 $ 106,474
Other accrued expenses 125,424 108,362
Total $ 256,259 $ 214,836