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Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Securities loaned
Gross Amounts of Recognized Liabilities	$ 819,903	$ 1,130,039
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	819,903	1,130,039
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(806,960)	(1,108,461)
Cash Collateral Pledged	(5,242)	(8,822)
Net Amount	7,701	12,756
Securities sold under agreements to repurchase
Gross Amounts of Recognized Liabilities	290,000	281,861
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	290,000	281,861
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(290,000)	(281,861)
Cash Collateral Pledged	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	2,333,946	4,143,700
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(1,219,684)	(2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	1,114,262	1,423,746
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,100,874)	(1,401,373)
Cash Collateral Pledged	(5,242)	(9,614)
Net Amount	8,146	12,759
Currency forwards
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	1,219,684	2,720,749
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(1,219,684)	(2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	0	795
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	0	0
Cash Collateral Pledged	0	(792)
Net Amount	0	3
Options
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	4,359	11,051
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	4,359	11,051
Gross Amounts Not Offset In the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(3,914)	(11,051)
Cash Collateral Pledged	0	0
Net Amount	$ 445	$ 0

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