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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, 2014
Dec. 31, 2013
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued compensation and employee benefits $ 158,142us-gaap_EmployeeRelatedLiabilitiesCurrent $ 141,065us-gaap_EmployeeRelatedLiabilitiesCurrent
Other accrued expenses 139,937us-gaap_OtherAccruedLiabilitiesCurrent 116,541us-gaap_OtherAccruedLiabilitiesCurrent
Total $ 298,079us-gaap_AccruedLiabilitiesCurrent $ 257,606us-gaap_AccruedLiabilitiesCurrent