Business Segments and Enterprise-Wide Information (Schedule Of Contributions By Major Customers) (Details) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Wal-Mart Stores Inc.
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	16.60%	15.50%	15.20%
Walgreen Co.
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	13.40%	13.80%	14.70%
The Kroger Company
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	9.80%	9.80%	10.00%