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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ 2,171	$ 1,088
Provision	1,581	474
Write offs	(1,203)	(483)
Ending balance	$ 2,549	$ 1,079
Accounts receivable, general payment terms	30 days
Accounts receivable, international extended payment terms greater than	90 days

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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