Accrued Liabilities (Schedule Of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accrued Liabilities, Current [Abstract]
Accrued expenses (Note 2)	$ 68,180		$ 65,212
Accrued employee compensation and related expenses	86,061		109,488
Accrued taxes	25,623		26,609
Accrued customer incentives and refund obligations	61,462		59,374
Current lease liabilities (Notes 2 and 7)	15,003		0
Accrued liabilities	$ 256,329	$ 274,459	$ 260,683