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Supplementary Balance Sheet Detail (Schedule Of Analysis Of The Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 7,573	$ 4,153		$ 3,892
Additions	2,914	5,161	1,438
Deductions	(3,769)	(1,741)	(1,177)
Balance at end of year	$ 6,718	$ 7,573	$ 4,153	$ 3,892

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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