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Financial Information by Geographic Area Data
3 Months Ended
Jun. 30, 2011
Segments, Geographical Areas [Abstract]  
12. Industry Segment and Geographic Area Data
12. Industry Segment and Geographic Area Data
 
   
United States
  
Canada
  
Consolidated
 
   
(Unaudited)
 
   
(All amounts are in thousands of U.S. $'s)
 
Quarter ended June 30, 2011
         
Total revenues
 $601,091  $41,874  $642,965 
Depreciation and amortization, net of (gains) losses on disposals
  46,864   1,869   48,733 
Interest expense
  22,470   163   22,633 
Pretax earnings
  118,357   7,373   125,730 
Income tax expense
  45,329   2,178   47,507 
Identifiable assets
  4,026,330   148,126   4,174,456 
 

   
United States
  
Canada
  
Consolidated
 
   
(Unaudited)
 
   
(All amounts are in thousands of U.S. $'s)
 
Quarter ended June 30, 2010
         
Total revenues
 $549,783  $36,164  $585,947 
Depreciation and amortization, net of (gains) losses on disposals
  45,037   1,745   46,782 
Interest expense
  21,310   154   21,464 
Pretax earnings
  99,882   6,763   106,645 
Income tax expense
  38,151   1,992   40,143 
Identifiable assets
  3,758,773   120,767   3,879,540