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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, 2012	Dec. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Balance at beginning of period	$ 6,951	$ 6,209	$ 3,456
Additions Charged to expense	6,358	6,761	7,319
Additions Charged to other accounts	0	0	0
Write-offs net of recoveries	(3,535)	(6,019)	(4,566)
Balance at end of period	$ 9,774	$ 6,951	$ 6,209

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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