Operations And Summary Of Significant Accounting Policies (Schedule Of Warranty Reserve) (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]
Warranty reserve, Balance at the beginning of the period	$ 1,271	$ 921	$ 921
Accruals for warranties issued during the period	2,270	2,954	1,993
Settlements made (in cash or in kind) during the period	(2,106)	(2,604)	(1,993)
Warranty reserve, Balance at the end of the period	$ 1,435	$ 1,271	$ 921