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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property Plant and Equipments [Abstract]      
Property and equipment $ 230,407 $ 148,426  
Less accumulated depreciation and amortization (40,460) (24,427)  
Property and equipment, net 189,947 123,999  
Property Plant and Equipments (Textual) [Abstract]      
Depreciation and Amortization Including Assets Under Capital Lease 16,339 11,376 7,228
Land [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 9,504 8,282  
Land improvements [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 1,688 1,597  
Buildings [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 118,445 48,323  
Equipment under capital leases [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 5,310 4,502  
Leasehold improvements [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 17,305 11,407  
Computer equipment [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 46,993 36,742  
Furniture, fixtures and equipment [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 13,366 11,401  
Internally developed Software [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 7,108 3,825  
Other [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment 1,098 998  
Construction in progress [Member]
     
Property Plant and Equipments [Abstract]      
Property and equipment $ 9,590 $ 21,349