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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Net income $ 138,045 $ 111,096 $ 401,293 $ 321,404
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 8,408 7,945 25,141 23,058
Amortization 14,674 13,200 43,749 39,417
Equity in earnings of unconsolidated affiliate (35,005) (28,305) (103,420) (86,488)
Distributions received from unconsolidated affiliate     110,559 107,180
Stock-based compensation 11,318 6,467 31,173 20,458
Provision for losses on receivables     1,569 109
Deferred income tax expense     (6,639) (7,731)
Net (gain) loss from investments $ 575 $ (776) (134) 1,310
Change in other long-term liabilities     2,103 (4,442)
Change in other assets     314 (965)
Contract costs capitalized, net of amortization     (482) (2,842)
Other     921 (1,053)
Change in current assets and liabilities (Increase) decrease in        
Receivables from investment products     (4,537) 2,521
Receivables     (58,537) (37,921)
Other current assets     (3,919) (6,186)
Advances due from unconsolidated affiliate     51,422 12,641
(Decrease) increase in        
Accounts payable     3,006 8,615
Accrued liabilities     (9,851) 8,809
Deferred revenue     150 (1,370)
Total adjustments     82,588 75,120
Net cash provided by operating activities     $ 483,881 $ 396,524