Accounts Receivable Reserves (Components Of Accounts Receivables) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivable Reserves [Abstract]
Gross accounts receivable	$ 156,790	$ 131,602
Accounts receivable reserves	(1,560)	(1,459)
Accounts receivable, net	$ 155,230	$ 130,143