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Operating Segments Property and Equipment Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Operating Segments And Geographic Information [Abstract]
United States	$ 47,587	$ 39,063
International	34,654	28,621
Property and equipment, net	$ 82,241	$ 67,684

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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