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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Accounting Policies [Abstract] |  |
Net income | $ 109,242 | $ 113,981
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation | 7,473 | 7,331
Amortization | 13,077 | 12,679
Equity in earnings of unconsolidated affiliate | (29,907) | (37,317)
Distributions received from unconsolidated affiliate | 52,036 | 33,237
Stock-based compensation | 6,929 | 5,038
Provision for losses on receivables | 80 | (85)
Deferred income tax expense | (1,879) | (984)
Net loss (gain) from investments | (3,989) | 1,279
Change in other long-term liabilities | 360 | 277
Change in other assets | (4,658) | 1,334
Contract costs capitalized, net of amortization | (1,769) | (138)
Other | (1,612) | (63)
(Increase) decrease in |  |
Receivables from investment products | 2,553 | (2,693)
Receivables | (17,852) | (18,304)
Other current assets | (9,728) | 574
(Decrease) increase in |  |
Accounts payable | 8,663 | (5,678)
Accrued liabilities | (36,818) | (47,836)
Deferred revenue | (1,207) | (175)
Total adjustments | (10,270) | (54,082)
Net cash provided by operating activities | $ 98,972 | $ 59,899

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