Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Accrued expenses	$ 60,774	$ 71,984
Accrued employee compensation and related expenses	79,687	91,113
Accrued taxes	24,859	23,973
Accrued customer programs	55,187	49,061
Accrued liabilities	$ 220,507	$ 236,131