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Derivative Instruments - Gain From Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Gain impact of derivative instruments not designated as hedging instruments    
Gain impact that derivative instruments not designated as hedging instruments had on results of operations $ 114,210 $ 307,983
Futures    
Gain impact of derivative instruments not designated as hedging instruments    
Gain impact that derivative instruments not designated as hedging instruments had on results of operations 165,590 308,480
Currency forwards    
Gain impact of derivative instruments not designated as hedging instruments    
Gain impact that derivative instruments not designated as hedging instruments had on results of operations (51,381) (425)
Options    
Gain impact of derivative instruments not designated as hedging instruments    
Gain impact that derivative instruments not designated as hedging instruments had on results of operations $ 1 (74)
Interest rate swaps    
Gain impact of derivative instruments not designated as hedging instruments    
Gain impact that derivative instruments not designated as hedging instruments had on results of operations   $ 2