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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current Assets:    
Receivables, allowance for doubtful accounts $ 878 $ 651
Property and Equipment, accumulated depreciation 230,899 220,064
Capitalized Software, accumulated amortization $ 198,746 $ 180,062
SEI Investments shareholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 750,000,000 750,000,000
Common stock, shares issued 167,683,000 169,242,000
Common stock, shares outstanding 167,683,000 169,242,000