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Net investment in sales-type leases (Schedule of components of the net investment in sales-type leases) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Sales-type leases term 3 years    
Net minimum lease payments to be received $ 1,588 $ 0 $ 0
Less unearned interest income portion (151) 0 0
Net investment in sales-type leases 1,437 0 0
Less current portion (498) 0 0
Non-current net investment in sales-type leases $ 939 $ 0 $ 0