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Summary Of Significant Accounting Policies (Schedule Of Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Beginning balance	$ 2,304	$ 2,470	$ 2,036
Charged to general and administrative	(337)	31	485
Amounts written off	(208)	(197)	(51)
Recoveries included in general and administrative	(737)
Ending balance	$ 1,359	$ 2,304	$ 2,470

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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