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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
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