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Billing Dispute (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 Customer Disputing Billing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivable disputed	$ 1,504	$ 2,135	$ 1,500

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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