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Principal Accounting Policies (Schedule Of Allowance For Uncollectible Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Principal Accounting Policies [Abstract]
Balance at beginning of period	$ 6,209	$ 3,456	$ 5,248
Additions Charged to expense	6,761	7,319	8,007
Additions Charged to other accounts
Write-offs net of recoveries	(6,019)	(4,566)	(9,799)
Balance at end of period	$ 6,951	$ 6,209	$ 3,456

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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