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Segment Information - Assets by Segment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets by segment	$ 69,154	$ 55,222
United States
Assets by segment	57,236	43,174
Canada
Assets by segment	6,326	6,033
Europe
Assets by segment	$ 5,592	$ 6,015

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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