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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, 2018 | Mar. 31, 2017
Accounting Policies [Abstract] |  |
Net income | $ 139,838 | $ 88,737
Depreciation | 7,122 | 6,800
Amortization | 11,854 | 12,022
Equity in earnings of unconsolidated affiliate | (40,607) | (33,565)
Distributions received from unconsolidated affiliate | 45,617 | 35,265
Stock-based compensation | 5,195 | 6,180
Provision for losses on receivables | 93 | (5)
Deferred income tax expense | 2,083 | 877
Net gain from investments | 410 | (347)
Change in other long-term liabilities | 579 | 965
Change in other assets | 290 | (849)
Other | (784) | 56
Decrease (increase) in Receivables from investment products | 1,757 | 10,308
Decrease (increase) in Receivables | (25,657) | (24,243)
Decrease (increase) in Other current assets | (3,564) | (2,298)
Increase (decrease) in Accounts payable | 3,195 | 1,406
Increase (decrease) in Accrued liabilities | (43,522) | (27,754)
Increase (decrease) in Deferred revenue | 275 | (543)
Total adjustments | (35,664) | (15,725)
Net cash provided by operating activities | $ 104,174 | $ 73,012

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