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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accounting Policies [Abstract]        
Net income $ 91,769 $ 81,005 $ 180,506 $ 158,502
Depreciation 6,599 6,434 13,399 12,881
Amortization 12,565 11,284 24,587 22,296
Equity in earnings of unconsolidated affiliate (36,315) (30,285) (69,880) (59,477)
Distributions received from unconsolidated affiliate     75,142 67,061
Stock-based compensation 6,259 4,189 12,439 7,978
Provision for losses on receivables     157 297
Deferred income tax expense     918 (311)
Gain from sale of SEI AK $ 0 $ 0 0 (2,791)
Net gain from investments     (391) (124)
Tax benefit on stock options exercised (1)     0 4,004
Change in other long-term liabilities     (503) 865
Change in other assets     122 1,084
Other     492 1,030
Decrease (increase) in Receivables from investment products     12,713 1,032
Decrease (increase) in Receivables     (34,744) (19,357)
Decrease (increase) in Other current assets     (4,378) (4,006)
Increase (decrease) in Accounts payable     (2,329) (970)
Increase (decrease) in Accrued liabilities     (23,324) (27,634)
Increase (decrease) in Deferred revenue     (71) 1,094
Total adjustments     4,349 4,952
Net cash provided by operating activities     $ 184,855 $ 163,454