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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]        
Net income $ 81,005 $ 86,240 $ 158,502 $ 170,851
Depreciation 6,434 5,843 12,881 11,838
Amortization 11,284 10,611 22,296 20,969
Equity in earnings of unconsolidated affiliates (30,285) (37,289) (59,477) (71,322)
Distributions received from unconsolidated affiliate     67,061 74,847
Stock-based compensation 4,189 3,859 7,978 7,609
Provision for losses on receivables     297 (128)
Deferred income tax expense     (311) 482
Gain on sale of SEI AK $ 0 $ 0 (2,791) (2,791)
Net loss (gain) from investments     (124) (212)
Change in other long-term liabilities     865 914
Change in other assets     1,084 (643)
Other     1,030 (1,269)
Decrease (increase) in Receivables from investment products     1,032 1,473
Decrease (increase) in Receivables     (19,357) (21,502)
Decrease (increase) in Other current assets     (4,006) (6,745)
Increase (decrease) in Accounts payable     (970) (3,813)
Increase (decrease) in Accrued liabilities     (27,634) (27,412)
Increase (decrease) in Deferred revenue     1,094 3,638
Total adjustments     948 (14,067)
Net cash provided by operating activities     $ 159,450 $ 156,784