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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2011
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
4. Supplemental Cash Flow Information

 

     Years Ended December 31  
     2011      2010      2009  

Cash paid during the year for

        

Interest and financing expenses (net of capitalization)

   $ 17,329       $ 15,884       $ 12,456   

Income taxes

   $ 96,919       $ 59,949       $ 94,093