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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 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Reverse repurchase agreements |  |
Securities Purchased under Agreements to Resell, Gross | $ 232,223 | $ 282,042
Securities Purchased under Agreements to Resell, Liability | 232,223 | 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 | 216,419 | 224,672
Securities Borrowed, Liability | 0 | 0
Securities borrowed | 216,419 | 224,672
Securities Borrowed, Collateral, Obligation to Return Securities | (210,012) |
Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Securities Borrowed, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 6,407 | 5,573
Gross Amounts of Recognized Assets | 448,642 | 506,714
Gross Amounts Offset in the Balance Sheet | (232,223) | (75,543)
Net Amounts of Assets Presented on the Balance Sheet | 216,419 | 431,171
Financial Instruments | (210,012) | (422,365)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Net Amount | 6,407 | 8,806
Repurchase agreements |  |
U.S. Treasury and agency securities | 665,135 | 726,988
Securities Sold under Agreements to Repurchase, Asset | 232,223 |
Net Amounts of Liabilities Presented on the Balance Sheet | 432,912 | 651,445
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (425,411) | (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 | 7,501 | 5,947
Securities loaned: |  |
Equity securities | 125,548 | 130,658
Securities Loaned, Asset | 0 | 0
Securities loaned | 125,548 | 130,658
Securities Loaned, Collateral, Right to Reclaim Securities | (123,587) | (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 | 1,961 | 8,008
Gross amount of recognized liabilities for repurchase agreements and securities loaned | 790,683 | 857,646
Gross Amounts Offset in the Balance Sheet | (232,223) | (75,543)
Net Amounts of Liabilities Presented on the Balance Sheet | 558,460 | 782,103
Financial Instruments | (548,998) | (768,148)
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Net Amount | $ 9,462 | 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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