Receivables (Allowances For Discounts, Returns, Claims And Doubtful Accounts) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 78,335	$ 78,947	$ 72,603
Acquisitions	6,510	0	7,750
Additions charged to net sales or costs and expenses	308,507	296,419	272,329
Deductions	307,249	297,031	273,735
Balance at end of year	$ 86,103	$ 78,335	$ 78,947