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Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Equities futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	$ 2,950	$ (15,382)
Derivatives Assets, Notional	2,523	2,891,606
Equities futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	181	468
Derivatives Liabilities, Notional	165,238	106,487
Commodity futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	6,660	69,235
Derivatives Assets, Notional	9,712,453	11,595,215
Commodity futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	1,872	(375)
Derivatives Liabilities, Notional	4,674,521	54,782
Currency futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	4,185	(9,432)
Derivatives Assets, Notional	2,855,717	3,756,914
Currency futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	4,911	(30,643)
Derivatives Liabilities, Notional	2,554,681	6,239,725
Fixed income futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	2	(28)
Derivatives Assets, Notional	6,888	18,694
Fixed income futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	0	93
Derivatives Liabilities, Notional	0	8,591
Options
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	3,914	11,899
Derivatives Liabilities, Fair Value	4,359	11,051
Options | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	3,914	11,899
Derivatives Assets, Notional	435,244	659,101
Options | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	4,359	11,051
Derivatives Liabilities, Notional	459,274	608,756
Currency forwards
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	1,212,911	2,792,373
Derivatives Liabilities, Fair Value	1,219,684	2,720,749
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	1,212,911	2,792,373
Derivatives Assets, Notional	134,607,800	171,288,432
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	1,219,684	2,720,749
Derivatives Liabilities, Notional	134,611,187	171,252,224
Currency forwards | Derivative instruments designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	0	(792)
Derivatives Liabilities, Notional	$ 0	$ 13,501

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

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-Publisher FASB
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