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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accounting Policies [Abstract] |  |  |  |
Net income | $ 121,677 | $ 91,769 | $ 261,515 | $ 180,506
Depreciation | 7,138 | 6,599 | 14,260 | 13,399
Amortization | 12,161 | 12,565 | 24,015 | 24,587
Equity in earnings of unconsolidated affiliate | (41,073) | (36,315) | (81,680) | (69,880)
Distributions received from unconsolidated affiliate |  |  | 89,362 | 75,142
Stock-based compensation | $ 5,323 | $ 6,259 | 10,518 | 12,439
Provision for losses on receivables |  |  | (90) | 157
Deferred income tax expense |  |  | 4,893 | 918
Net loss (gain) from investments |  |  | 549 | (391)
Change in long-term income taxes payable |  |  | (1,000) | 0
Change in other long-term liabilities |  |  | 1,222 | (503)
Change in other assets |  |  | (4,713) | 122
Other |  |  | (3,206) | 494
Decrease (increase) in Receivables from investment products |  |  | 3,280 | 12,713
Decrease (increase) in Receivables |  |  | (31,835) | (34,744)
Decrease (increase) in Other current assets |  |  | (5,090) | (4,378)
Increase (decrease) in Accounts payable |  |  | 2,251 | (2,329)
Increase (decrease) in Accrued liabilities |  |  | (22,121) | (23,324)
Increase (decrease) in Deferred revenue |  |  | 746 | (71)
Total adjustments |  |  | 1,361 | 4,351
Net cash provided by operating activities |  |  | $ 262,876 | $ 184,857

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