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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 | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accounting Policies [Abstract] |  |
Net income | $ 88,737 | $ 77,497
Depreciation | 6,800 | 6,447
Amortization | 12,022 | 11,012
Equity in earnings of unconsolidated affiliate | (33,565) | (29,192)
Distributions received from unconsolidated affiliate | 35,265 | 34,525
Stock-based compensation | 6,180 | 3,789
Provision for losses on receivables | (5) | 51
Deferred income tax expense | 877 | (1,029)
Gain from sale of SEI AK | 0 | (2,791)
Net (gain) loss from investments | (347) | 126
Tax benefit on stock options exercised (1) | 0 | 624
Change in other long-term liabilities | 965 | 279
Change in other assets | (849) | 1,099
Other | 56 | 676
Decrease (increase) in Receivables from investment products | 10,308 | (3,535)
Decrease (increase) in Receivables | (24,243) | (6,585)
Decrease (increase) in Other current assets | (2,298) | (2,622)
Increase (decrease) in Accounts payable | 1,406 | (157)
Increase (decrease) in Accrued liabilities | (27,754) | (12,120)
Increase (decrease) in Deferred revenue | (543) | 551
Total adjustments | (15,725) | 1,148
Net cash provided by operating activities | $ 73,012 | $ 78,645

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