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Financial Information by Geographic Area Data
3 Months Ended
Jun. 30, 2012
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, 2012
         
Total revenues
 $623,923  $41,493  $665,416 
Depreciation and amortization, net of (gains) losses on disposals
  56,963   1,973   58,936 
Interest expense
  23,339   152   23,491 
Pretax earnings
  119,384   8,004   127,388 
Income tax expense
  44,698   2,121   46,819 
Identifiable assets
  4,690,153   148,683   4,838,836 
              
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