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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Accounting Policies [Abstract] |  |  |  |
Net income | $ 101,066 | $ 126,540 | $ 210,308 | $ 240,521
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 7,640 | 7,422 | 15,113 | 14,753
Amortization | 13,140 | 12,781 | 26,217 | 25,460
Equity in earnings of unconsolidated affiliate | (28,276) | (37,832) | (58,183) | (75,149)
Distributions received from unconsolidated affiliate |  |  | 84,502 | 77,288
Stock-based compensation | 7,062 | 5,064 | 13,991 | 10,102
Provision for losses on receivables |  |  | (122) | 383
Deferred income tax expense |  |  | (5,459) | (2,050)
Net loss (gain) from investments | $ (1,903) | $ (231) | 2,086 | (1,510)
Change in other long-term liabilities |  |  | (1,448) | 1,129
Change in other assets |  |  | (6,135) | 249
Contract costs capitalized, net of amortization |  |  | (2,117) | (1,125)
Other |  |  | (1,217) | 122
(Increase) decrease in |  |  |  |
Receivables from investment products |  |  | 4,292 | (2,538)
Receivables |  |  | (11,134) | (20,192)
Other current assets |  |  | (2,716) | 3,708
(Decrease) increase in |  |  |  |
Accounts payable |  |  | 6,357 | (5,426)
Accrued liabilities |  |  | (9,367) | (47,631)
Deferred revenue |  |  | (836) | (449)
Total adjustments |  |  | 53,824 | (22,876)
Net cash provided by operating activities |  |  | $ 264,132 | $ 217,645

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