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Accounts Receivable (Allowance For Doubtful Accounts Related To Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Accounts Receivable [Abstract]
Allowance for doubtful accounts beginning of period	$ 15,315	$ 14,256
Provision for bad debts	4,957	3,847
Write-offs	(2,530)	(2,916)
Allowance for doubtful accounts end of period	$ 17,742	$ 15,187

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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