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Assets held for sale and discontinued operations (Tables)
12 Months Ended
Dec. 31, 2011
Assets held for sale and discontinued operations [Abstract]  
Revenue and income from discontinued operations
Revenue and net loss from discontinued operations were as follows:

   
2010
  
2009
 
Revenue
 $-  $816 
          
Loss from operations
 $-  $(155)
(Loss) gain on disposal
  (1,244)  155 
Income tax benefit
  473   - 
Net loss from discontinued operations
 $(771) $-