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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Net income $ 126,540 $ 121,677 $ 240,521 $ 261,515
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 7,422 7,138 14,753 14,260
Amortization 12,781 12,161 25,460 24,015
Equity in earnings of unconsolidated affiliate (37,832) (41,073) (75,149) (81,680)
Distributions received from unconsolidated affiliate     77,288 89,362
Stock-based compensation $ 5,064 $ 5,323 10,102 10,518
Provision for losses on receivables     383 (90)
Deferred income tax expense     (2,050) 4,893
Net (gain) loss from investments     (1,510) 549
Change in long-term income taxes payable     0 (1,000)
Change in other long-term liabilities     1,129 1,222
Change in other assets     249 (4,713)
Contract costs capitalized, net of amortization     (1,125) (2,880)
Other     122 (326)
(Increase) decrease in        
Receivables from investment products     (2,538) 3,280
Receivables     (20,192) (31,835)
Other current assets     3,708 (5,090)
(Decrease) increase in        
Accounts payable     (5,426) 2,251
Accrued liabilities     (47,631) (22,121)
Deferred revenue     (449) 746
Total adjustments     (22,876) 1,361
Net cash provided by operating activities     $ 217,645 $ 262,876