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Summary Of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2013
Accounting Policies [Abstract] |
Calculation Of Basic And Diluted Earnings Per Share | The calculations of basic and diluted earnings per share for the three months ended March 31, 2013 and 2012 are:
| For the Three Months Ended March 31, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per Share Amount
Basic earnings per common share | $ | 71,920 |  |  | 172,598 |  |  | $ | 0.42 |
Dilutive effect of stock options | — |  |  | 3,407 |  |  |
Diluted earnings per common share | $ | 71,920 |  |  | 176,005 |  |  | $ | 0.41 |
| For the Three Months Ended March 31, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per Share Amount
Basic earnings per common share | $ | 49,965 |  |  | 176,348 |  |  | $ | 0.28 |
Dilutive effect of stock options | — |  |  | 1,320 |  |  |
Diluted earnings per common share | $ | 49,965 |  |  | 177,668 |  |  | $ | 0.28 |
Employee stock options to purchase 6,863,000 and 14,329,000 shares of common stock, with an average exercise price of $28.05 and $23.43, were outstanding during the three months ended March 31, 2013 and 2012, respectively, but not included in the computation of diluted earnings per common share because the effect on diluted earnings per common share would have been anti-dilutive.
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities | The following table provides the details of the adjustments to reconcile net income to net cash provided by operating activities for the three months ended March 31:
| 2013 |  | 2012
Net income | $ | 72,270 |  |  | $ | 50,235 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation | 5,704 |  |  | 5,432 |
Amortization | 8,242 |  |  | 7,622 |
Equity in earnings of unconsolidated affiliates | (27,588 | ) |  | (27,330 | )
Distributions received from unconsolidated affiliate | 27,821 |  |  | 21,593 |
Stock-based compensation | 5,293 |  |  | 4,033 |
Provision for losses on receivables | 216 |  |  | (48 | )
Deferred income tax expense | (7,730 | ) |  | (517 | )
Gain from sale of SEI AK (See Note 13) | (22,112 | ) |  | — |
Net realized gains from investments | (280 | ) |  | (3,205 | )
Change in other long-term liabilities | 368 |  |  | 2,556 |
Change in other assets | 2,832 |  |  | (1,385 | )
Other | (7,996 | ) |  | 2,656 |
Change in current asset and liabilities |  |  |
Decrease (increase) in |  |  |
Restricted cash for broker-dealer operations | 500 |  |  | — |
Receivables from regulated investment companies | (5,473 | ) |  | (9,183 | )
Receivables | (9,127 | ) |  | (4,413 | )
Other current assets | (2,466 | ) |  | (1,687 | )
Increase (decrease) in |  |  |
Accounts payable | (4,618 | ) |  | 242 |
Accrued liabilities | 4,571 |  |  | (6,575 | )
Deferred revenue | (952 | ) |  | (802 | )
Total adjustments | (32,795 | ) |  | (11,011 | )
Net cash provided by operating activities | $ | 39,475 |  |  | $ | 39,224 |
Reclassifications Certain prior year amounts have been reclassified to conform to current year presentation.

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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