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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
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