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Schedule of Amounts receivable (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Accounts receivable (net of allowance for doubtful accounts of $0; 2012 - $0) $ 1,458 $ 1,046
Notes receivable (net of allowance for doubtful accounts of $0; 2012 - $0) 0 10
Lease receivable 0 12
Amounts receivable (net of allowance for doubtful accounts of $0; 2012 - $0) $ 1,458 $ 1,068