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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