Schedule II-Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance For Doubtful Accounts Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 21,569	$ 21,423	$ 34,217
Charged to Expenses	6,673	6,795	(839)
Deductions	(4,370)	(4,491)	(10,504)
Translation Adjustments	(1,245)	(2,158)	(1,451)
Balance at End of Period	22,627	21,569	21,423
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	30,983	21,160	14,578
Charged to Expenses	7,745	12,592	7,295
Deductions	(2,308)	(2,660)	(1,320)
Translation Adjustments	(86)	(109)	607
Balance at End of Period	$ 36,334	$ 30,983	$ 21,160