Operations And Summary Of Significant Accounting Policies (Schedule Of Warranty Reserve) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operations And Summary Of Significant Accounting Policies [Abstract]
Balance at the beginning of the period	$ 1,435	$ 1,271	$ 921
Accruals for warranties issued during the period	3,737	2,270	2,954
Settlements made (in cash or in kind) during the period	3,408	2,106	2,604
Balance at the end of the period	$ 1,764	$ 1,435	$ 1,271