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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]        
Net income $ 128,319 $ 101,739 $ 389,834 $ 282,245
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation 7,255 6,948 21,515 20,347
Amortization 12,405 13,745 36,420 38,332
Equity in earnings of unconsolidated affiliate (41,726) (39,333) (123,406) (109,213)
Distributions received from unconsolidated affiliate     138,216 117,447
Stock-based compensation $ 5,878 $ 7,088 16,396 19,527
Provision for losses on receivables     (29) 176
Deferred income tax expense     8,378 1,143
Net loss (gain) from investments     460 (1,036)
Change in long-term income taxes payable     (9,859) 0
Change in other long-term liabilities     1,930 106
Change in other assets     (4,214) 79
Contract costs capitalized, net of amortization     (3,463) 0
Other     (99) 1,070
Decrease (increase) in        
Receivables from investment products     2,263 10,800
Receivables     (44,878) (43,661)
Other current assets     (5,955) (2,962)
Increase (decrease) in        
Accounts payable     3,893 (1,748)
Accrued liabilities     (9,717) (15,856)
Deferred revenue     213 (409)
Total adjustments     28,064 34,142
Net cash provided by operating activities     $ 417,898 $ 316,387