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Derivative Instruments - Gain From Derivative Instruments (Details) - Not designated as hedging instruments - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
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 $ 307,983 $ 1,162,272
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 308,480 1,180,483
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 (425) (16,431)
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 (74) (1,784)
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 $ 4