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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Assets |  |
Financial instruments owned, at fair value | $ 2,211,819 | $ 1,848,806
Financial instruments owned, at fair value, counterparty and cash collateral netting | (1,209,506) | (2,790,242)
Financial instruments owned and pledged | 740,630 | 791,115
Other assets | 49,046 | 48,273
Liabilities |  |
Financial instruments sold, not yet purchased | 2,294,625 | 2,475,395
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (1,219,684) | (2,719,954)
Currency forwards |  |
Assets |  |
Financial instruments owned, at fair value | 3,405 | 2,131
Financial instruments owned, at fair value, counterparty and cash collateral netting | (1,209,506) | (2,790,242)
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 795
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting | (1,219,684) | (2,719,954)
Options |  |
Assets |  |
Financial instruments owned, at fair value | 3,914 | 11,899
Liabilities |  |
Financial instruments sold, not yet purchased | 4,359 | 11,051
Equity securities |  |
Assets |  |
Financial instruments owned, at fair value | 1,931,485 | 1,609,901
Financial instruments owned and pledged | 697,090 | 748,846
Liabilities |  |
Financial instruments sold, not yet purchased | 2,087,833 | 2,268,330
U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value | 170,442 |
Financial instruments owned and pledged |  | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 70,198 | 115,112
U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value |  | 106,013
Corporate Bonds |  |
Assets |  |
Financial instruments owned, at fair value | 82,412 | 87,500
Liabilities |  |
Financial instruments sold, not yet purchased | 99,587 | 40,123
Exchange traded notes |  |
Assets |  |
Financial instruments owned, at fair value | 20,161 | 31,362
Financial instruments owned and pledged | 43,540 | 42,269
Liabilities |  |
Financial instruments sold, not yet purchased | 32,648 | 39,984
Equity investment |  |
Assets |  |
Other assets | 46,529 | 45,856
Exchange stock |  |
Assets |  |
Other assets | 2,517 | 2,417
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Financial instruments owned, at fair value | 904,468 | 694,441
Financial instruments owned and pledged | 376,729 | 396,778
Other assets | 2,517 | 2,417
Liabilities |  |
Financial instruments sold, not yet purchased | 1,083,126 | 1,055,472
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency forwards |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Options |  |
Assets |  |
Financial instruments owned, at fair value | 3,914 | 11,899
Liabilities |  |
Financial instruments sold, not yet purchased | 4,359 | 11,051
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities |  |
Assets |  |
Financial instruments owned, at fair value | 733,310 | 587,680
Financial instruments owned and pledged | 376,711 | 389,810
Liabilities |  |
Financial instruments sold, not yet purchased | 1,005,560 | 931,992
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value | 152,884 |
Financial instruments owned and pledged |  | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 69,364 | 112,058
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value |  | 91,466
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes |  |
Assets |  |
Financial instruments owned, at fair value | 14,360 | 3,396
Financial instruments owned and pledged | 18 | 6,968
Liabilities |  |
Financial instruments sold, not yet purchased | 3,843 | 371
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investment |  |
Assets |  |
Other assets | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock |  |
Assets |  |
Other assets | 2,517 | 2,417
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Financial instruments owned, at fair value | 2,516,857 | 3,944,607
Financial instruments owned and pledged | 363,901 | 394,337
Other assets | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 2,431,183 | 4,139,877
Significant Other Observable Inputs (Level 2) | Currency forwards |  |
Assets |  |
Financial instruments owned, at fair value | 1,212,911 | 2,792,373
Liabilities |  |
Financial instruments sold, not yet purchased | 1,219,684 | 2,720,749
Significant Other Observable Inputs (Level 2) | Options |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Other Observable Inputs (Level 2) | Equity securities |  |
Assets |  |
Financial instruments owned, at fair value | 1,198,175 | 1,022,221
Financial instruments owned and pledged | 320,379 | 359,036
Liabilities |  |
Financial instruments sold, not yet purchased | 1,082,273 | 1,336,338
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value | 17,558 |
Financial instruments owned and pledged |  | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 834 | 3,054
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value |  | 14,547
Significant Other Observable Inputs (Level 2) | Corporate Bonds |  |
Assets |  |
Financial instruments owned, at fair value | 82,412 | 87,500
Liabilities |  |
Financial instruments sold, not yet purchased | 99,587 | 40,123
Significant Other Observable Inputs (Level 2) | Exchange traded notes |  |
Assets |  |
Financial instruments owned, at fair value | 5,801 | 27,966
Financial instruments owned and pledged | 43,522 | 35,301
Liabilities |  |
Financial instruments sold, not yet purchased | 28,805 | 39,613
Significant Other Observable Inputs (Level 2) | Equity investment |  |
Assets |  |
Other assets | 0 | 0
Significant Other Observable Inputs (Level 2) | Exchange stock |  |
Assets |  |
Other assets | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Financial instruments owned and pledged | 0 | 0
Other assets | 46,529 | 45,856
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | Currency forwards |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | Options |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity securities |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Financial instruments owned and pledged | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value | 0 |
Financial instruments owned and pledged |  | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations |  |
Assets |  |
Financial instruments owned, at fair value |  | 0
Significant Unobservable Inputs (Level 3) | Corporate Bonds |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | Exchange traded notes |  |
Assets |  |
Financial instruments owned, at fair value | 0 | 0
Financial instruments owned and pledged | 0 | 0
Liabilities |  |
Financial instruments sold, not yet purchased | 0 | 0
Significant Unobservable Inputs (Level 3) | Equity investment |  |
Assets |  |
Other assets | 46,529 | 45,856
Significant Unobservable Inputs (Level 3) | Exchange stock |  |
Assets |  |
Other assets | $ 0 | $ 0

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