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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
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounting Policies [Abstract] |  |  |  |
Net income | $ 111,276 | $ 133,778 | $ 301,584 | $ 263,248
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 8,286 | 8,424 | 16,384 | 16,733
Amortization | 16,508 | 14,723 | 33,395 | 29,075
Equity in earnings of unconsolidated affiliate | (29,813) | (35,065) | (62,272) | (68,415)
Distributions received from unconsolidated affiliate |  |  | 69,824 | 68,064
Stock-based compensation | 10,007 | 10,103 | 20,573 | 19,855
Provision for losses on receivables |  |  | 350 | 2,088
Deferred income tax expense |  |  | (23,506) | (6,869)
Net loss (gain) from investments | $ 2,620 | $ (377) | 3,109 | (709)
Change in other long-term liabilities |  |  | 1,998 | 987
Change in other assets |  |  | (3,111) | (976)
Contract costs capitalized, net of amortization |  |  | 883 | 429
Other |  |  | (1,521) | 929
Change in current assets and liabilities (Increase) decrease in |  |  |  |
Receivables from investment products |  |  | 4,125 | (906)
Receivables |  |  | (25,523) | (26,437)
Other current assets |  |  | (7,014) | 538
Advances due from unconsolidated affiliate |  |  | 53,500 | 51,364
(Decrease) increase in |  |  |  |
Accounts payable |  |  | (7) | 1,525
Accrued liabilities |  |  | (55,734) | (25,721)
Deferred revenue |  |  | 3,578 | 195
Total adjustments |  |  | 29,031 | 61,749
Net cash provided by operating activities |  |  | $ 330,615 | $ 324,997

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