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Property and Equipment
9 Months Ended
Sep. 30, 2011
Property and Equipment [Abstract] 
Property and Equipment
6. Property and Equipment
Property and equipment consist of the following:
                 
    As of     As of  
    September     December  
    30, 2011     31, 2010  
Land
  $ 9,504     $ 8,282  
Land improvements
    1,669       1,597  
Buildings
    108,396       48,323  
Equipment under capital leases
    5,310       4,502  
Leasehold improvements
    14,851       11,407  
Computer equipment
    43,316       36,742  
Furniture, fixtures and equipment
    13,042       11,401  
Internally developed software
    6,023       3,825  
Other
    1,099       998  
Construction in progress
    12,285       21,349  
 
           
 
    215,495       148,426  
Less accumulated depreciation and amortization
    (35,950 )     (24,427 )
 
           
Property and equipment, net
  $ 179,545     $ 123,999