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Summary Of Significant Accounting Policies (Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounting Policies [Abstract]
Net income	$ 72,270	$ 50,235
Depreciation	5,704	5,432
Amortization	8,242	7,622
Equity in earnings of unconsolidated affiliate	(27,588)	(27,330)
Distributions received from unconsolidated affiliate	(27,821)	(21,593)
Stock-based compensation	5,293	4,033
Provision for Doubtful Accounts	216	(48)
Deferred income tax expense	(7,730)	(517)
Gain on sale of subsidiary	(22,112)	0
Net realized gains from investments	(280)	(3,205)
Change in other long-term liabilities	368	2,556
Change in other assets	2,832	(1,385)
Other	(7,996)	2,656
Decrease (increase) in restricted cash for broker-dealer operations	500	0
Decrease (increase) in receivables from regulated investment companies	(5,473)	(9,183)
Decrease (increase) in Receivables	(9,127)	(4,413)
Decrease (increase) in Other Current Assets	(2,466)	(1,687)
Increase (decrease) in Accounts payable	(4,618)	242
Increase (decrease) in Accrued liabilities	4,571	(6,575)
Increase (decrease) in Deferred revenue	(952)	(802)
Total adjustments	(32,795)	(11,011)
Net cash provided by operating activities	$ 39,475	$ 39,224

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