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PROPERTY AND EQUIPMENT (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property and Equipment      
Total $ 598,198,000 $ 501,597,000  
Accumulated depreciation (402,801,000) (330,970,000)  
Property and equipment, net 195,397,000 170,627,000  
Depreciation      
Depreciation and other amortization 44,800,000 42,500,000 41,900,000
Amortization of capitalized software development 29,700,000 27,200,000 23,400,000
Computer software and development
     
Property and Equipment      
Total 282,225,000 232,408,000  
Furniture and equipment
     
Property and Equipment      
Total 202,268,000 147,788,000  
Leasehold Improvements
     
Property and Equipment      
Total 79,930,000 69,152,000  
Capital Leases
     
Property and Equipment      
Total 7,402,000 46,865,000  
Construction in Progress
     
Property and Equipment      
Total $ 26,373,000 $ 5,384,000