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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accounting Policies [Abstract]    
Net income $ 129,470 $ 109,242
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 8,309 7,473
Amortization 14,352 13,077
Equity in earnings of unconsolidated affiliate (33,350) (29,907)
Distributions received from unconsolidated affiliate 28,774 40,226
Stock-based compensation 9,752 6,929
Provision for losses on receivables 1,207 80
Deferred income tax expense (3,915) (1,879)
Net (gain) loss from investments (332) 3,989
Change in other long-term liabilities 1,043 360
Change in other assets 507 (4,658)
Contract costs capitalized, net of amortization 351 (1,769)
Other 992 (1,612)
Change in current assets and liabilities (Increase) decrease in    
Receivables from investment products (2,020) 2,553
Receivables (22,016) (17,852)
Other current assets (4,113) (9,728)
Advances due from unconsolidated affiliate 51,266 11,810
(Decrease) increase in    
Accounts payable (2,237) 8,663
Accrued liabilities (41,717) (36,818)
Deferred revenue 250 (1,207)
Total adjustments 7,103 (10,270)
Net cash provided by operating activities $ 136,573 $ 98,972