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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Property and Equipment    
Property and equipment, gross $ 25,735 $ 23,372
Less: accumulated depreciation and amortization (19,531) (17,185)
Property and equipment, net 6,204 6,187
Computer and other related equipment [Member]
   
Property and Equipment    
Property and equipment, gross 15,321 13,671
Purchased and internally developed software [Member]
   
Property and Equipment    
Property and equipment, gross 7,373 6,667
Furniture and fixtures [Member]
   
Property and Equipment    
Property and equipment, gross 1,232 1,229
Leasehold Improvements [Member]
   
Property and Equipment    
Property and equipment, gross $ 1,809 $ 1,805