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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 | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Reverse repurchase agreements |  |
Securities Purchased under Agreements to Resell, Gross | $ 320,688 | $ 282,042
Securities Purchased under Agreements to Resell, Liability | 320,688 | 75,543
Securities purchased under agreements to resell | 0 | 206,499
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities | 0 | (203,266)
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash | 0 | 0
Securities Purchased under Agreements to Resell, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 0 | 3,233
Securities borrowed |  |
Securities Borrowed, Gross | 190,963 | 224,672
Securities Borrowed, Liability | 0 | 0
Securities borrowed | 190,963 | 224,672
Securities Borrowed, Collateral, Obligation to Return Securities | (185,319) |
Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Securities Borrowed, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 5,644 | 5,573
Gross Amounts of Recognized Assets | 511,651 | 506,714
Gross Amounts Offset in the Balance Sheet | (320,688) | (75,543)
Net Amounts of Assets Presented on the Balance Sheet | 190,963 | 431,171
Financial Instruments | (185,319) | (422,365)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Net Amount | 5,644 | 8,806
Repurchase agreements |  |
U.S. Treasury and agency securities | 850,440 | 726,988
Securities Sold under Agreements to Repurchase, Asset | 320,688 |
Net Amounts of Liabilities Presented on the Balance Sheet | 529,752 | 651,445
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (518,518) | (645,498)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 0 | 0
Securities Sold under Agreements to Repurchase, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 11,234 | 5,947
Securities loaned: |  |
Equity securities | 143,157 | 130,658
Securities Loaned, Asset | 0 | 0
Securities loaned | 143,157 | 130,658
Securities Loaned, Collateral, Right to Reclaim Securities | (139,315) | (122,650)
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 3,842 | 8,008
Gross amount of recognized liabilities for repurchase agreements and securities loaned | 993,597 | 857,646
Gross Amounts Offset in the Balance Sheet | (320,688) | (75,543)
Net Amounts of Liabilities Presented on the Balance Sheet | 672,909 | 782,103
Financial Instruments | (657,833) | (768,148)
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Net Amount | $ 15,076 | 13,955
Securities Borrowed [Member] |  |
Securities borrowed |  |
Securities Borrowed, Collateral, Obligation to Return Securities |  | (219,099)
Repurchase Agreements [Member] |  |
Repurchase agreements |  |
Securities Sold under Agreements to Repurchase, Asset |  | $ 75,543

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