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Allowance For Doubtful Accounts (Schedule Of Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts [Abstract]
Balance, beginning of year	$ 4,700	$ 3,159	$ 1,727
Provision	2,169	2,408	1,852
Amounts written off, net of recoveries	(2,284)	(867)	(420)
Balance, end of year	$ 4,585	$ 4,700	$ 3,159

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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