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Revenue Recognition (Schedule of Loss Related to Principal Transactions) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Principal transactions and proprietary trading |  |  |  |
Realized and unrealized gain on primarily riskless principal transactions | $ 1,698,000 | $ 4,114,000 | $ 3,616,000 | $ 8,369,000
Realized and unrealized gain on primarily riskless principal transactions, year over year decrease | (2,416,000) |  | (4,753,000) |
Unrealized loss on U.S. government securities | (617,000) | (7,000) | (2,802,000) | (14,000)
Unrealized loss on portfolio of U.S. government securities, year over year decrease | (610,000) |  | (2,788,000) |
Total Principal transactions and proprietary trading | 1,081,000 | $ 4,107,000 | 814,000 | $ 8,355,000
Total Principal transactions and proprietary trading, year over year decrease | $ (3,026,000) |  | $ (7,541,000) |

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- Definition Realized and unrealized gain on primarily riskless principal transactions, year over year decrease. + References No definition available. + Details
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- Definition Total Principal transactions and proprietary trading, year over year decrease. + References No definition available. + Details
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- Definition Unrealized loss on portfolio of U.S. government securities, year over year decrease. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss), from the firm's direct investment activity, conducted separately from customer trading activities, and includes, but is 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 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2,3) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(g),(h)) -URI https://asc.fasb.org/extlink&oid=120399700&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 https://asc.fasb.org/extlink&oid=35711157&loc=d3e42567-110969 + Details
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