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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Net income $ 133,778 $ 101,066 $ 263,248 $ 210,308
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 8,424 7,640 16,733 15,113
Amortization 14,723 13,140 29,075 26,217
Equity in earnings of unconsolidated affiliate (35,065) (28,276) (68,415) (58,183)
Distributions received from unconsolidated affiliate     68,064 73,241
Stock-based compensation 10,103 7,062 19,855 13,991
Provision for losses on receivables     2,088 (122)
Deferred income tax expense     (6,869) (5,459)
Net (gain) loss from investments $ (377) $ (1,903) (709) 2,086
Change in other long-term liabilities     987 (1,448)
Change in other assets     (976) (6,135)
Contract costs capitalized, net of amortization     429 (2,117)
Other     929 (1,217)
Change in current assets and liabilities (Increase) decrease in        
Receivables from investment products     (906) 4,292
Receivables     (26,437) (11,134)
Other current assets     538 (2,716)
Advances due from unconsolidated affiliate     51,364 11,261
(Decrease) increase in        
Accounts payable     1,525 6,357
Accrued liabilities     (25,721) (9,367)
Deferred revenue     195 (836)
Total adjustments     61,749 53,824
Net cash provided by operating activities     $ 324,997 $ 264,132