Operations And Summary Of Significant Accounting Policies (Adjustment For Excess And Obsolete Inventories) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operations And Summary Of Significant Accounting Policies [Abstract]
Balance at Beginning of Period	$ 4,205	$ 3,340	$ 4,390
Provisions	1,824	3,554	1,785
Write-Offs	2,185	2,689	2,835
Balance at End of Period	$ 3,844	$ 4,205	$ 3,340