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Allowance For Doubtful Accounts - Rollforward (Details) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 4,569	$ 4,278	$ 4,002
Charged to Costs and Expenses	2,072	855	860
Write-Offs Charged to Allowance	(737)	(607)	(538)
Effect of Exchange Rate Changes	495	43	(46)
Ending Balance	$ 6,399	$ 4,569	$ 4,278

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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