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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Net income | $ 132,168 | $ 128,319 | $ 372,689 | $ 389,834
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 7,409 | 7,255 | 22,162 | 21,515
Amortization | 12,947 | 12,405 | 38,407 | 36,420
Equity in earnings of unconsolidated affiliate | (37,609) | (41,726) | (112,758) | (123,406)
Distributions received from unconsolidated affiliate |  |  | 123,663 | 138,216
Stock-based compensation | $ 5,453 | $ 5,878 | 15,555 | 16,396
Provision for losses on receivables |  |  | 593 | (29)
Deferred income tax expense |  |  | (1,405) | 8,378
Net (gain) loss from investments |  |  | (2,121) | 460
Change in long-term income taxes payable |  |  | 0 | (9,859)
Change in other long-term liabilities |  |  | 2,077 | 1,930
Change in other assets |  |  | (56) | (4,214)
Contract costs capitalized, net of amortization |  |  | (4,499) | (3,463)
Other |  |  | (721) | (99)
(Increase) decrease in |  |  |  |
Receivables from investment products |  |  | (2,271) | 2,263
Receivables |  |  | (34,589) | (44,878)
Other current assets |  |  | 729 | (5,955)
(Decrease) increase in |  |  |  |
Accounts payable |  |  | (2,208) | 3,893
Accrued liabilities |  |  | (34,087) | (9,717)
Deferred revenue |  |  | 375 | 213
Total adjustments |  |  | 8,846 | 28,064
Net cash provided by operating activities |  |  | $ 381,535 | $ 417,898

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