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Collateralized Transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Reverse repurchase agreements |  |  |  |
Gross Amounts of Recognized Assets | $ 24,006 |  | $ 282,042 |
Gross Amounts Offset on the Balance Sheet | 0 |  | (75,543) |
Net Amounts of Assets Presented on the Balance Sheet | 24,006 |  | 206,499 |
Financial Instruments | (23,972) |  | (203,266) |
Cash Collateral Received | 0 |  | 0 |
Net Amount | 34 |  | 3,233 |
Securities borrowed |  |  |  |
Gross Amounts of Recognized Assets | 154,090 | [1] | 224,672 | [2]
Gross Amounts Offset on the Balance Sheet | 0 | [1] | 0 | [2]
Net Amounts of Assets Presented on the Balance Sheet | 154,090 | [1] | 224,672 | [2]
Financial Instruments | (150,510) | [1] | (219,099) | [2]
Cash Collateral Received | 0 | [1] | 0 | [2]
Net Amount | 3,580 | [1] | 5,573 | [2]
Total |  |  |  |
Gross Amounts of Recognized Assets | 178,096 |  | 506,714 |
Gross Amounts Offset on the Balance Sheet | 0 |  | (75,543) |
Net Amounts of Assets Presented on the Balance Sheet | 178,096 |  | 431,171 |
Financial Instruments | (174,482) |  | (422,365) |
Cash Collateral Received | 0 |  | 0 |
Net Amount | 3,614 |  | 8,806 |
Repurchase agreements |  |  |  |
Gross Amounts of Recognized Liabilities | 378,084 |  | 726,988 |
Gross Amounts Offset on the Balance Sheet | 0 |  | (75,543) |
Net Amounts of Liabilities Presented on the Balance Sheet | 378,084 |  | 651,445 |
Financial Instruments | (376,273) |  | (645,498) |
Cash Collateral Pledged | 0 |  | 0 |
Net Amount | 1,811 |  | 5,947 |
Securities loaned |  |  |  |
Gross Amounts of Recognized Liabilities | 179,875 | [3] | 130,658 | [4]
Gross Amounts Offset on the Balance Sheet | 0 | [3] | 0 | [4]
Net Amounts of Liabilities Presented on the Balance Sheet | 179,875 | [3] | 130,658 | [4]
Financial Instruments | (171,991) | [3] | (122,650) | [4]
Cash Collateral Pledged | 0 | [3] | 0 | [4]
Net Amount | 7,884 | [3] | 8,008 | [4]
Total |  |  |  |
Gross Amounts of Recognized Liabilities | 557,959 |  | 857,646 |
Gross Amounts Offset on the Balance Sheet | 0 |  | (75,543) |
Net Amounts of Liabilities Presented on the Balance Sheet | 557,959 |  | 782,103 |
Financial Instruments | (548,264) |  | (768,148) |
Cash Collateral Pledged | 0 |  | 0 |
Net Amount | $ 9,695 |  | $ 13,955 |
[1] | Included in receivable from brokers, dealers and clearing organizations on the consolidated balance sheet.
[2] | Included in receivable from brokers, dealers and clearing organizations on the consolidated balance sheet.
[3] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.
[4] | Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.

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