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Operations And Summary Of Significant Accounting Policies (Schedule Of Allowance For Doubtful Accounts And Sales Returns) (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	$ 4,241	$ 3,768	$ 4,619
Provisions	1,216	385	(578)
Write-Offs	587	(88)	273
Balance at End of Period	$ 4,870	$ 4,241	$ 3,768

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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