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Inventories
12 Months Ended
Dec. 31, 2011
Inventories [Abstract]  
Inventories
2. Inventories
 
Inventories consist of the following (in thousands):
 
   
December 31
 
   
2011
  
2010
 
Raw materials and parts
 $125,730  $96,731 
Work-in-process
  71,490   60,463 
Finished goods
  80,157   77,583 
Used equipment
  21,688   18,204 
Total
 $299,065  $252,981