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Summary of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Accounting Policies [Abstract] |  |  |  |
Net income | $ 82,813 | $ 83,494 | $ 157,633 | $ 155,764
Depreciation | 5,331 | 5,730 | 10,915 | 11,434
Amortization | 9,584 | 8,427 | 18,798 | 16,669
Equity in earnings of unconsolidated affiliates | (34,226) | (27,588) | (66,117) | (55,176)
Distributions received from unconsolidated affiliate |  |  | 69,470 | 53,797
Stock-based compensation | 2,872 | 10,607 | 5,695 | 15,900
Provision for losses on receivables |  |  | 227 | 483
Deferred income tax expense |  |  | 5,270 | (10,000)
Gain on sale of SEI AK | 0 | 0 | (5,582) | (22,112)
Net gain from investments |  |  | (527) | (103)
Change in other long-term liabilities |  |  | 1,113 | 825
Change in other assets |  |  | (2,564) | 559
Other |  |  | 1,443 | (7,251)
Decrease (increase) in Restricted cash for broker-dealer operations |  |  | 0 | 500
Decrease (increase) in Receivables from regulated investment companies |  |  | (4,680) | (4,874)
Decrease (increase) in Receivables |  |  | (21,245) | (16,407)
Decrease (increase) in Other current assets |  |  | (5,392) | 344
Increase (decrease) in Accounts payable |  |  | (7,765) | (9,433)
Increase (decrease) in Accrued liabilities |  |  | (13,061) | (6,467)
Increase (decrease) in Deferred revenue |  |  | (639) | (1,138)
Total adjustments |  |  | (14,641) | (32,450)
Net cash provided by operating activities |  |  | $ 142,992 | $ 123,314

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