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Revenues from Contracts with Customers (Schedule of Total Revenues Broken Out by Revenues from Contracts with Customers and Other Sources of Revenues) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenue from contracts with customers	$ 633,108	$ 516,338
Other	4,767	3,782
Total revenue from contracts with customers	633,108	516,338
Other sources of revenue:
Interest	161,177	191,071
Principal transactions	138,666	104,032
Other	4,440	8,427
Total revenues	937,391	819,868
Commissions [Member]
Revenues:
Revenue from contracts with customers	211,098	155,449
Investment Banking [Member]
Revenues:
Revenue from contracts with customers	179,468	161,840
Asset Management and Service Fees [Member]
Revenues:
Revenue from contracts with customers	$ 237,775	$ 195,267

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Revenue from contract with customer excluding other segment revenue and assessed tax.

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Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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Amount of realized and unrealized gain (loss) resulting from the difference between acquisition price and selling price or fair value of trading assets and trading liabilities, and from the firm's direct investment activity, conducted separately from customer trading activities, including, but not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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