Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accrued Liabilities [Abstract]
Accrued expenses	$ 55,545	$ 71,984
Accrued employee compensation and related expenses	49,249	91,113
Accrued taxes	21,272	23,973
Accrued customer programs	48,697	49,061
Accrued liabilities	$ 174,763	$ 236,131