Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current Assets:
Receivables, allowance for doubtful accounts	$ 656	$ 784
Property and Equipment, accumulated depreciation	253,039	241,295
Capitalized Software, accumulated amortization	$ 239,369	$ 218,514
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	165,860,000	166,688,000
Common stock, shares outstanding	165,860,000	166,668,000