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Property and Equipment (Computation of Net Property and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Computer Equipment [Member]
years
Jun. 30, 2011
Office Equipment [Member]
Jun. 30, 2011
Furniture and Fixtures [Member]
Jun. 30, 2011
Leasehold Improvements [Member]
years
Computer equipment $ 38,558 $ 32,525        
Office equipment 4,317 3,784        
Furniture and fixtures 3,502 3,378        
Leasehold improvements 3,569 3,361        
Total property and equipment, gross 49,946 43,048        
Less: Accumulated depreciation (28,414) (24,173)        
Total property and equipment, net $ 21,532 $ 18,875        
Estimated useful life (in years), minimum     3     3
Estimated useful life (in years), maximum     5     13
Estimated useful life (in years)       5 5