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Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Fair value measurements measured on a recurring basis
Transfers of financial assets between levels	$ 0		$ 0
Assets
Financial instruments owned, at fair value	1,276,022	$ 1,038,039
Financial instruments owned, pledged as collateral	247,652	259,175
Other assets: exchange stock	6,250	5,984
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,411,609	979,090
Equity securities
Assets
Financial instruments owned, pledged as collateral	244,868	232,731
Exchange traded notes
Assets
Financial instruments owned, pledged as collateral	2,784	26,444
Fair value measurements measured on a recurring basis | Total Fair Value
Assets
Financial instruments owned, at fair value	1,276,022	1,038,039
Financial instruments owned, pledged as collateral	247,652	259,175
Other assets: exchange stock	6,250	5,984
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,411,609	979,090
Fair value measurements measured on a recurring basis | Total Fair Value | Interest rate swaps
Assets
Financial instruments owned, at fair value	351	311
Liabilities
Financial instruments sold, not yet purchased, at fair value	357	163
Fair value measurements measured on a recurring basis | Total Fair Value | Currency forwards
Assets
Financial instruments owned, at fair value	3,047	9,580
Liabilities
Financial instruments sold, not yet purchased, at fair value	5,088	319
Fair value measurements measured on a recurring basis | Total Fair Value | Options
Assets
Financial instruments owned, at fair value	220	168
Liabilities
Financial instruments sold, not yet purchased, at fair value	211
Fair value measurements measured on a recurring basis | Total Fair Value | Equity securities
Assets
Financial instruments owned, at fair value	1,224,827	948,091
Financial instruments owned, pledged as collateral	244,868	232,731
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,375,346	936,851
Fair value measurements measured on a recurring basis | Total Fair Value | US and non-US government obligations
Assets
Financial instruments owned, at fair value	8,238	10,513
Liabilities
Financial instruments sold, not yet purchased, at fair value		3,996
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange traded notes
Assets
Financial instruments owned, at fair value	39,339	69,376
Financial instruments owned, pledged as collateral	2,784	26,444
Liabilities
Financial instruments sold, not yet purchased, at fair value	30,607
Fair value measurements measured on a recurring basis | Total Fair Value | Exchange stock
Assets
Other assets: exchange stock	6,250	5,984
Liabilities
Financial instruments sold, not yet purchased, at fair value		37,761
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Financial instruments owned, at fair value	1,227,129	985,224
Financial instruments owned, pledged as collateral	247,652	259,175
Other assets: exchange stock	6,250	5,984
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,401,564	976,828
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets
Financial instruments owned, at fair value	1,187,790	915,848
Financial instruments owned, pledged as collateral	244,868	232,731
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,370,957	935,071
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | US and non-US government obligations
Liabilities
Financial instruments sold, not yet purchased, at fair value		3,996
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes
Assets
Financial instruments owned, at fair value	39,339	69,376
Financial instruments owned, pledged as collateral	2,784	26,444
Liabilities
Financial instruments sold, not yet purchased, at fair value	30,607
Fair value measurements measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock
Assets
Other assets: exchange stock	6,250	5,984
Liabilities
Financial instruments sold, not yet purchased, at fair value		37,761
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Financial instruments owned, at fair value	1,444,566	838,670
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,462,924	748,276
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps
Assets
Financial instruments owned, at fair value	351	311
Liabilities
Financial instruments sold, not yet purchased, at fair value	357	163
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Currency forwards
Assets
Financial instruments owned, at fair value	1,398,720	795,435
Liabilities
Financial instruments sold, not yet purchased, at fair value	1,457,967	319
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Options
Assets
Financial instruments owned, at fair value	220	168
Liabilities
Financial instruments sold, not yet purchased, at fair value	211	746,014
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities
Assets
Financial instruments owned, at fair value	37,037	32,243
Liabilities
Financial instruments sold, not yet purchased, at fair value	4,389	1,780
Fair value measurements measured on a recurring basis | Significant Other Observable Inputs (Level 2) | US and non-US government obligations
Assets
Financial instruments owned, at fair value	8,238	10,513
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting
Assets
Financial instruments owned, at fair value	(1,395,673)	(785,855)
Liabilities
Financial instruments sold, not yet purchased, at fair value	(1,452,879)	(746,014)
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting | Currency forwards
Assets
Financial instruments owned, at fair value	(1,395,673)	(785,855)
Liabilities
Financial instruments sold, not yet purchased, at fair value	$ (1,452,879)
Fair value measurements measured on a recurring basis | Counterparty and Cash Collateral Netting | Options
Liabilities
Financial instruments sold, not yet purchased, at fair value		$ (746,014)

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