Business Segments and Enterprise-Wide Information (Schedule Of Contributions By Major Customers) (Details)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	10.00%
Wal-Mart Stores Inc [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	15.50%	16.60%
Walgreen Co [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	15.10%	17.00%
Kroger Company [Member]
Revenue, Major Customer [Line Items]
Percentage of revenue contributed by major customers	10.10%	11.00%