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Consolidated Statements Of Changes In Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Capital In Excess Of Par Value [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income [Member] | SEI Investments [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2010 |  | $ 1,861 | $ 565,393 | $ 471,159 | $ 3,157 |  |
Beginning balance, shares at Dec. 31, 2010 |  | 186,141,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Purchase and retirement of common stock |  | (111) | (27,196) | (183,858) |  |  |
Purchase and retirement of common stock, shares |  | (11,109,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,892 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 110,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 14 | 22,314 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | 1,364,000 | 1,364,000 |  |  |  |  |
Stock-based compensation | (14,112) |  | 14,112 |  |  |  |
Tax benefit on stock options exercised |  |  | 1,434 |  |  |  |
Net income attributable to SEI Investments Company | 204,959 |  |  | 204,959 |  |  |
Dividends declared ($0.42, $0.63 and $0.27 per share) | (48,558) |  |  | (48,558) |  |  |
Other comprehensive (loss) income | (1,960) |  |  |  | (1,257) |  |
Total SEI Investments Shareholders' Equity |  |  |  |  |  | 1,025,316 |
Noncontrolling Interest | 16,143 |  |  |  |  |  | 16,143
Total Equity at Dec. 31, 2011 | 1,041,459 | 1,765 | 577,949 | 443,702 | 1,900 |  |
Ending balance, shares at Dec. 31, 2011 |  | 176,506,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Purchase and retirement of common stock |  | (75) | (19,370) | (135,819) |  |  |
Purchase and retirement of common stock, shares |  | (7,528,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,794 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 105,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 31 | 47,613 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | 3,136,000 | 3,137,000 |  |  |  |  |
Stock-based compensation | (15,736) |  | 15,736 |  |  |  |
Tax benefit on stock options exercised |  |  | 583 |  |  |  |
Net income attributable to SEI Investments Company | 206,848 |  |  | 206,848 |  |  |
Dividends declared ($0.42, $0.63 and $0.27 per share) | (108,817) |  |  | (108,817) |  |  |
Other comprehensive (loss) income | 6,159 |  |  |  | 4,339 |  |
Total SEI Investments Shareholders' Equity | 1,038,180 |  |  |  |  | 1,038,180 |
Noncontrolling Interest | 19,149 |  |  |  |  |  | 19,149
Total Equity at Dec. 31, 2012 | 1,057,329 | 1,722 | 624,305 | 405,914 | 6,239 |  |
Ending balance, shares at Dec. 31, 2012 | 172,220,000 | 172,220,000 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Purchase and retirement of common stock |  | (68) | (19,105) | (190,769) |  |  |
Purchase and retirement of common stock, shares |  | (6,789,000) |  |  |  |  |
Issuance of common stock under the employee stock purchase plan |  | 1 | 1,950 |  |  |  |
Issuance of common stock under the employee stock purchase plan, shares |  | 78,000 |  |  |  |  |
Issuance of common stock upon exercise of stock options |  | 37 | 64,379 |  |  |  |
Issuance of common stock upon exercise of stock options, shares | 3,733,000 | 3,733,000 |  |  |  |  |
Stock-based compensation | (37,865) |  | 37,865 |  |  |  |
Tax benefit on stock options exercised |  |  | 11,825 |  |  |  |
Net income attributable to SEI Investments Company | 288,124 |  |  | 288,124 |  |  |
Dividends declared ($0.42, $0.63 and $0.27 per share) | (71,665) |  |  | (71,665) |  |  |
Other comprehensive (loss) income | (5,203) |  |  |  | (4,752) |  |
Total SEI Investments Shareholders' Equity | 1,156,002 |  |  |  |  | 1,156,002 |
Noncontrolling Interest | 0 |  |  |  |  |  | 0
Total Equity at Dec. 31, 2013 | $ 1,156,002 | $ 1,692 | $ 721,219 | $ 431,604 | $ 1,487 |  |
Ending balance, shares at Dec. 31, 2013 | 169,242,000 | 169,242,000 |  |  |  |  |

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