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Credit Risk - Changes in the Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,672
Charged to expense	51	325
Write-offs	(74)
Foreign currency translation adjustment	(2)
Balance at end of period	$ 1,647

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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