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Revenues from Contracts with Customers (Schedule of Total Revenues Separated between Revenues from Contracts with Customers and Other Sources of Revenues) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues: |  |  |  |  |  |  |
Revenue from contracts with customers | [1] | $ 531,349 |  |  | $ 1,073,005 |  |
Other | [1] | 3,796 |  |  | 7,514 |  |
Total revenue from contracts with customers |  | 531,329 |  |  | 1,072,985 |  |
Other sources of revenue: |  |  |  |  |  |  |
Interest |  | 154,421 |  | $ 108,951 | 292,155 |  | $ 209,904
Principal transactions |  | 88,984 |  | 95,703 | 186,766 |  | 212,560
Other |  | 5,277 |  |  | 4,916 |  |
Total revenues |  | 780,011 |  | 742,291 | 1,556,822 |  | 1,433,718
Commissions [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Revenue from contracts with customers |  | 166,902 |  | 172,264 | 332,677 |  | 347,538
Investment Banking [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Revenue from contracts with customers |  | 161,063 |  | 185,261 | 337,425 |  | 312,113
Asset Management and Service Fees [Member] |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |
Revenue from contracts with customers |  | $ 199,568 | [1] | $ 172,914 | $ 395,369 | [1] | $ 335,653
[1] | Excludes revenue included in the Other segment.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42567-110969 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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