SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reserves For Doubtful Accounts, Sales Returns, And Allowances
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Balance at Beginning of Year	$ 27,543	$ 21,078	$ 16,262
Additions Charged to Profit & Loss	21,755	26,346	18,674
Write-offs	(16,792)	(22,157)	(15,321)
Foreign Currency Impact	(1,639)	(23)	1,383
Other	(342)	2,299	80
Balance at Close of Year	30,525	27,543	21,078
Net collections on accounts previously written off	409	1,029	310
Valuation Allowance For Deferred Tax Assets
VALUATION AND QUALIFYING ACCOUNTS AND RESERVES
Balance at Beginning of Year	29,682	20,124	9,242
Additions Charged to Profit & Loss	3,563	5,088	10,488
Foreign Currency Impact	(1,655)	(177)	394
Other	0	4,647
Balance at Close of Year	$ 31,590	$ 29,682	$ 20,124