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Other Intangible Assets
 6 Months Ended
Jun. 30, 2011
Other Intangible Assets [Abstract]  
Other Intangible Assets
6. Other Intangible Assets
                         
    As at June 30, 2011  
            Accumulated     Net Book  
    Cost     Amortization     Value  
Patents and trademarks
  $ 7,570     $ 5,078     $ 2,492  
Other
    250       250       —  
 
                 
 
  $ 7,820     $ 5,328     $ 2,492  
 
                 
                         
    As at December 31, 2010  
            Accumulated     Net Book  
    Cost     Amortization     Value  
Patents and trademarks
  $ 7,289     $ 4,852     $ 2,437  
Other
    250       250       —  
 
                 
 
  $ 7,539     $ 5,102     $ 2,437  
 
                 
     The Company expects to amortize approximately $0.2 million of other intangible assets for the remainder of 2011 and $0.3 million for each of the next 5 years, respectively. Fully amortized other intangible assets are still in use by the Company.
     During the six months ended June 30, 2011, the Company acquired $0.3 million in patents and trademarks. The net book value of these patents and trademarks was $0.3 million as at June 30, 2011. The weighted average amortization period for these additions was 10 years.
     During the three and six months ended June 30, 2011, the Company incurred costs of $0.1 million, respectively, to renew or extend the term of acquired other intangible assets which were recorded in selling, general and administrative expenses.