Accounts And Other Receivables (Schedule Of Accounts And Other Receivable) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounts and Notes Receivable, Net [Abstract]
Accounts Receivable, Gross, Current	$ 122,182	$ 113,556
Customer receivables	127,664	123,439
Other accounts and notes receivable	5,482	9,883
Total accounts and other receivables	124,727	120,135
Allowance for Doubtful Accounts and Sales Returns	$ 2,937	$ 3,304