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Other Income (Tables)
 12 Months Ended
Dec. 31, 2013
Other Income And Expenses [Abstract]  
Summary of Other Income
     Year Ended
December 31,
2013
$		     Year Ended
December 31,
2012
$		     Year Ended
December 31,
2011
$		  

Gain on sale of other assets

      —         2,217       —    

Volatile organic compound emission plant lease income

      238       1,220       2,900  

Impairment and (loss) gain on sale of marketable securities

      (2,062 )      (2,560 )      3,372  

Miscellaneous income (loss)

      9,229       (511 )      6,088  

Loss on bond repurchase

      (1,759 )      —         —    
  

 

 

    

 

 

    

 

 

  

Other income

      5,646       366       12,360