Receivables (Net Components Of Receivables) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Customers, trade	$ 1,386,306	$ 1,243,533
Income tax receivable	8,616	21,835
Other	59,564	71,084
Receivables, gross	1,454,486	1,336,452
Less allowance for discounts, returns, claims and doubtful accounts	78,335	78,947
Receivables, net	$ 1,376,151	$ 1,257,505