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ACCOUNTING POLICIES (Details 3) (USD $)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Depreciation and amortization            
Total depreciation and amortization, including internal-use software and website development $ 3,839,000 $ 4,210,000 $ 11,935,000 $ 12,472,000 $ 15,813,000 $ 16,581,000
Cost of goods sold - direct
           
Depreciation and amortization            
Total depreciation and amortization, including internal-use software and website development 123,000 137,000 350,000 583,000    
Technology
           
Depreciation and amortization            
Total depreciation and amortization, including internal-use software and website development 3,371,000 3,766,000 10,570,000 11,009,000    
General and administrative
           
Depreciation and amortization            
Total depreciation and amortization, including internal-use software and website development 345,000 307,000 1,015,000 880,000    
Computer software | Minimum
           
Fixed assets            
Life     2 years      
Computer software | Maximum
           
Fixed assets            
Life     3 years      
Computer hardware
           
Fixed assets            
Life     3 years      
Furniture and equipment | Minimum
           
Fixed assets            
Life     3 years      
Furniture and equipment | Maximum
           
Fixed assets            
Life     5 years      
Internal-use software and website development
           
Additional Disclosure            
Capitalized costs 3,000,000 2,300,000 6,800,000 7,800,000    
Amortization of capitalized costs $ 2,000,000 $ 2,100,000 $ 6,300,000 $ 6,100,000    
Internal-use software and website development | Minimum
           
Fixed assets            
Life     2 years      
Internal-use software and website development | Maximum
           
Fixed assets            
Life     3 years