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Other (Loss) Income (Tables)
 6 Months Ended
Jun. 30, 2013
Other Income And Expenses [Abstract]  
Summary of Other (Loss) Income
     Three Months
Ended June 30,		     Six Months Ended
June 30,		  
     2013     2012     2013     2012  
     $     $     $     $  

Gain on sale of other assets

      —         —         —         2,217  

Loss on bond repurchase

      —         —         (1,759 )      —    

Volatile organic compound emission plant lease income

      39       617       197       1,045  

Impairment of marketable securities

      (2,062 )      —         (2,062 )      —    

Loss on sale of marketable securities

      —         —         —         (420 ) 

Miscellaneous income (loss)

      637       (528 )      7,480       (410 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  

Other (loss) income

      (1,386 )      89       3,856       2,432