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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accounting Policies [Abstract]    
Net income $ 190,308 $ 129,470
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 8,098 8,309
Amortization 16,887 14,352
Equity in earnings of unconsolidated affiliate (32,459) (33,350)
Distributions received from unconsolidated affiliate 32,961 28,774
Stock-based compensation 10,566 9,752
Provision for losses on receivables (214) 1,207
Deferred income tax expense (10,908) (3,915)
Net loss (gain) from investments 489 (332)
Change in other long-term liabilities 1,138 1,043
Change in other assets (706) 507
Contract costs capitalized, net of amortization 389 351
Other 1,228 992
Change in current assets and liabilities (Increase) decrease in    
Receivables from investment products 1,452 (2,020)
Receivables 3,979 (22,016)
Other current assets (2,556) (4,113)
Advances due from unconsolidated affiliate 54,636 51,266
(Decrease) increase in    
Accounts payable (2,273) (2,237)
Accrued liabilities (18,078) (41,717)
Deferred revenue 5,490 250
Total adjustments 70,119 7,103
Net cash provided by operating activities $ 260,427 $ 136,573