Derivative Instruments and Hedging Activities (Details 3) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Ria Operations [Member] \| Foreign Currency Gain (Loss) [Member]
Derivative Instruments, Loss [Line Items]
Gain (loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (2,126)	$ 7,085	$ 334	$ 8,380
HiFX Operations [Member] \| Trading Revenue [Member]
Derivative Instruments, Loss [Line Items]
Foreign Currency Exchange Margin	$ 16,100	$ 16,800	$ 34,700	$ 35,500

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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-Publisher FASB
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- Definition

The net gain on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance.

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