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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounting Policies [Abstract] |  |  |  |
Net income | $ 128,319 | $ 101,739 | $ 389,834 | $ 282,245
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |
Depreciation | 7,255 | 6,948 | 21,515 | 20,347
Amortization | 12,405 | 13,745 | 36,420 | 38,332
Equity in earnings of unconsolidated affiliate | (41,726) | (39,333) | (123,406) | (109,213)
Distributions received from unconsolidated affiliate |  |  | 138,216 | 117,447
Stock-based compensation | $ 5,878 | $ 7,088 | 16,396 | 19,527
Provision for losses on receivables |  |  | (29) | 176
Deferred income tax expense |  |  | 8,378 | 1,143
Net loss (gain) from investments |  |  | 460 | (1,036)
Change in long-term income taxes payable |  |  | (9,859) | 0
Change in other long-term liabilities |  |  | 1,930 | 106
Change in other assets |  |  | (4,214) | 79
Contract costs capitalized, net of amortization |  |  | (3,463) | 0
Other |  |  | (99) | 1,070
Decrease (increase) in |  |  |  |
Receivables from investment products |  |  | 2,263 | 10,800
Receivables |  |  | (44,878) | (43,661)
Other current assets |  |  | (5,955) | (2,962)
Increase (decrease) in |  |  |  |
Accounts payable |  |  | 3,893 | (1,748)
Accrued liabilities |  |  | (9,717) | (15,856)
Deferred revenue |  |  | 213 | (409)
Total adjustments |  |  | 28,064 | 34,142
Net cash provided by operating activities |  |  | $ 417,898 | $ 316,387

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