Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Accrued expenses	$ 61,262	$ 71,984
Accrued employee compensation and related expenses	72,189	91,113
Accrued taxes	22,633	23,973
Accrued customer programs	54,097	49,061
Accrued liabilities	$ 210,181	$ 236,131