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Segment Reporting (Schedule Of Net Revenues Earned On Major Geographical Areas) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Total net revenues	[1]	$ 742,732	$ 725,647	$ 1,493,090	$ 1,401,178
United States [Member]
Segment Reporting Information [Line Items]
Total net revenues		703,225	689,756	1,409,293	1,337,494
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total net revenues		35,301	32,771	76,859	57,290
Other [Member]
Segment Reporting Information [Line Items]
Total net revenues		$ 4,206	$ 3,120	$ 6,938	$ 6,394
[1] No individual client accounted for more than 10 percent of total net revenues for the three and six months ended June 30, 2018 or 2017.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income after deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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