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Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Accrued Liabilities, Current [Abstract]      
Accrued expenses $ 61,301   $ 64,430
Accrued employee compensation and related expenses 87,184   102,944
Accrued taxes 28,082   29,389
Accrued customer incentives and refund obligations (Notes 2 and 3) 61,864   56,655
Total accrued liabilities $ 238,431 $ 254,381 $ 253,418