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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  | $ 2,187,145 |  |
Other |  |  |  |  |  |  |  |  | 15,568 |  |
Total revenue from contracts with customers |  |  |  |  |  |  |  |  | 2,187,145 |  |
Other sources of revenue: |  |  |  |  |  |  |  |  |  |  |
Interest | $ 184,534 | $ 169,760 | $ 154,421 | $ 137,734 | $ 126,615 | $ 117,862 | $ 108,951 | $ 100,953 | 646,449 | $ 454,381 | $ 294,332
Principal transactions |  |  |  |  |  |  |  |  | 351,378 | 396,826 | 475,428
Other |  |  |  |  |  |  |  |  | 9,985 |  |
Total revenues | $ 851,325 | $ 786,810 | $ 780,011 | $ 776,811 | $ 823,950 | $ 738,794 | $ 742,291 | $ 691,427 | 3,194,957 | 2,996,462 | 2,642,370
Commissions [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  | 657,732 | 678,904 | 729,989
Investment Banking [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  | 707,670 | 726,763 | 513,034
Asset Management and Service Fees [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  | $ 806,175 | $ 702,064 | $ 582,789

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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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