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Collateralized Transactions - Schedule of Gross Amount Recognized Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
U.S. Treasury and agency securities |  | $ 378,084
Repurchase agreements: |  |
Securities Loaned, Gross |  | $ 179,875
Maturity Overnight and Open [Member] |  |
Securities loaned: |  |
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement | $ 728,161 |
US Treasury and Government [Member] | Maturity Overnight and Open [Member] |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
U.S. Treasury and agency securities | 586,507 |
Equity Securities [Member] | Maturity Overnight and Open [Member] |  |
Repurchase agreements: |  |
Securities Loaned, Gross | $ 141,654 |

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- Definition Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral and funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL34722452-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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