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Summary of Significant Accounting Policies (Net Cash Provided by Operating Activities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]    
Net income $ 113,981 $ 139,838
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 7,331 7,122
Amortization 12,679 11,854
Equity in earnings of unconsolidated affiliate (37,317) (40,607)
Distributions received from unconsolidated affiliate 33,237 45,617
Stock-based compensation 5,038 5,195
Provision for losses on receivables (85) 93
Deferred income tax expense (984) 2,083
Net (gain) loss from investments (1,279) 410
Change in other long-term liabilities 277 579
Change in other assets 1,334 290
Contract costs capitalized, net of amortization (138) (1,234)
Other (63) 450
(Increase) decrease in    
Receivables from investment products (2,693) 1,757
Receivables (18,304) (25,657)
Other current assets 574 (3,564)
(Decrease) increase in    
Accounts payable (5,678) 3,195
Accrued liabilities (47,836) (43,522)
Deferred revenue (175) 275
Total adjustments (54,082) (35,664)
Net cash provided by operating activities $ 59,899 $ 104,174