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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets
Financial instruments owned, at fair value	$ 2,369,192	$ 2,068,734
Financial instruments owned, at fair value, Counterparty and Cash Collateral Netting	(291,964)	(211,398)
Financial instruments owned, pledged as collateral	746,539	696,956
Other Assets	68,316	48,966
Liabilities
Financial instruments sold, not yet purchased, at fair value	2,923,708	2,497,958
Financial instruments sold, not yet purchased, at fair value, Counterparty and Cash Collateral Netting	(292,870)	(196,535)
Interest rate swap	876,446	826,750
Interest rate swap
Liabilities
Interest rate swap	63,513
Equity securities
Assets
Financial instruments owned, at fair value	1,955,589	1,680,777
Financial instruments owned, pledged as collateral	734,024	654,366
Liabilities
Financial instruments sold, not yet purchased, at fair value	2,445,050	2,186,702
U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	199,782	127,537
Liabilities
Financial instruments sold, not yet purchased, at fair value	103,157	41,804
Corporate Bonds
Assets
Financial instruments owned, at fair value	135,518	171,591
Liabilities
Financial instruments sold, not yet purchased, at fair value	358,734	244,700
Exchange traded notes
Assets
Financial instruments owned, at fair value	19,827	49,137
Financial instruments owned, pledged as collateral	12,515	42,590
Liabilities
Financial instruments sold, not yet purchased, at fair value	7,431	21,646
Equity investment
Assets
Other Assets	66,030	46,245
Exchange stock
Assets
Other Assets	2,286	2,721
Currency forwards
Assets
Financial instruments owned, at fair value	49,396	31,154
Financial instruments owned, at fair value, Counterparty and Cash Collateral Netting	(291,964)	(211,398)
Liabilities
Financial instruments sold, not yet purchased, at fair value	95	19
Financial instruments sold, not yet purchased, at fair value, Counterparty and Cash Collateral Netting	(292,870)	(196,535)
Options
Assets
Financial instruments owned, at fair value	9,080	8,538
Liabilities
Financial instruments sold, not yet purchased, at fair value	9,241	3,087
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Financial instruments owned, at fair value	922,393	715,730
Financial instruments owned, pledged as collateral	496,945	362,451
Other Assets	2,286	2,721
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,399,496	1,065,007
Interest rate swap	3,517	49,514
Quoted Prices in Active Markets for Identical Assets (Level 1)  | Interest rate swap
Liabilities
Interest rate swap	0
Quoted Prices in Active Markets for Identical Assets (Level 1)  | Equity securities
Assets
Financial instruments owned, at fair value	761,484	600,259
Financial instruments owned, pledged as collateral	496,943	362,439
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,307,082	1,022,814
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	151,723	106,690
Liabilities
Financial instruments sold, not yet purchased, at fair value	83,173	39,091
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, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1)  | Exchange traded notes
Assets
Financial instruments owned, at fair value	106	243
Financial instruments owned, pledged as collateral	2	12
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	15
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	2,286	2,721
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, at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1)  | Options
Assets
Financial instruments owned, at fair value	9,080	8,538
Liabilities
Financial instruments sold, not yet purchased, at fair value	9,241	3,087
Significant Other Observable Inputs (Level 2)
Assets
Financial instruments owned, at fair value	1,738,763	1,564,402
Financial instruments owned, pledged as collateral	249,594	334,505
Other Assets	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,817,082	1,629,486
Interest rate swap	872,929	777,236
Significant Other Observable Inputs (Level 2)  | Interest rate swap
Liabilities
Interest rate swap	63,513
Significant Other Observable Inputs (Level 2)  | Equity securities
Assets
Financial instruments owned, at fair value	1,194,105	1,080,518
Financial instruments owned, pledged as collateral	237,081	291,927
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,137,968	1,163,888
Significant Other Observable Inputs (Level 2)  | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	48,059	20,847
Liabilities
Financial instruments sold, not yet purchased, at fair value	19,984	2,713
Significant Other Observable Inputs (Level 2)  | Corporate Bonds
Assets
Financial instruments owned, at fair value	135,518	171,591
Liabilities
Financial instruments sold, not yet purchased, at fair value	358,734	244,700
Significant Other Observable Inputs (Level 2)  | Exchange traded notes
Assets
Financial instruments owned, at fair value	19,721	48,894
Financial instruments owned, pledged as collateral	12,513	42,578
Liabilities
Financial instruments sold, not yet purchased, at fair value	7,431	21,631
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 Other Observable Inputs (Level 2)  | Currency forwards
Assets
Financial instruments owned, at fair value	341,360	242,552
Liabilities
Financial instruments sold, not yet purchased, at fair value	292,965	196,554
Significant Other Observable Inputs (Level 2)  | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Significant Unobservable Inputs (Level 3)
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned, pledged as collateral	0	0
Other Assets	66,030	46,245
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Interest rate swap	0	0
Significant Unobservable Inputs (Level 3)  | Interest rate swap
Liabilities
Interest rate swap	0
Significant Unobservable Inputs (Level 3)  | Equity securities
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned, pledged as collateral	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Significant Unobservable Inputs (Level 3)  | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Significant Unobservable Inputs (Level 3)  | Corporate Bonds
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Significant Unobservable Inputs (Level 3)  | Exchange traded notes
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned, pledged as collateral	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	0	0
Significant Unobservable Inputs (Level 3)  | Equity investment
Assets
Other Assets	66,030	46,245
Significant Unobservable Inputs (Level 3)  | Exchange stock
Assets
Other Assets	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, at fair value	0	0
Significant Unobservable Inputs (Level 3)  | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased, at fair value	$ 0	$ 0

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