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Derivative Instruments and Hedging Activities (Details Textual) - Foreign Exchange Contracts [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Xe Operations [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative asset, notional amount $ 1,300,000   $ 1,300,000  
United States of America, Dollars | Ria Operations [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative asset, notional amount 180   180  
Euro Member Countries, Euro | Ria Operations [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative asset, notional amount 213   $ 213  
Maximum [Member] | Ria Operations [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Foreign currency forward contract term     14 days  
Trading Revenue [Member] | Xe Operations [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Foreign currency exchange margin $ 14,400 $ 17,500 $ 45,700 $ 52,200