Derivative Instruments and Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Derivatives not designated as hedging instruments:

As of December 31, 2015
	Asset		Liability
Type of	Derivatives		Derivatives			Net
Futures Contracts	Fair Value		Fair Value			Fair Value
Agriculture	$	32,649	$	(61,049	)	$	(28,400	)
Currency		26,412		(863	)		25,549
Energy		104,889		(74,035	)		30,854
Indices		5,225		(23,774	)		(18,549	)
Interest rates		4,782		(21,653	)		(16,871	)
Metals		11,985		(9,213	)		2,772
	$	185,942	$	(190,587	)	$	(4,645	)

As of December 31, 2014
	Asset		Liability
Type of  futures,	Derivatives		Derivatives			Net
Futures Contracts	Fair Value		Fair Value			Fair Value
Agriculture	$	119,669	$	(95,121	)	$	24,548
Currency		60,876		(31,502	)		29,374
Energy		218,011		(15,424	)		202,587
Indices		12,875		(13,050	)		(175	)
Interest rates		168,536		(2,275	)		166,261
Metals		44,235		(875	)		43,360
	$	624,202	$	(158,247	)	$	465,955

Schedule of Derivative Instruments Included in Trading Activities [Table Text Block]

Trading gain (loss) for the following periods:

	Year ended December 31,
Type of Futures Contracts	2015			2014			2013
Agriculture	$	(177,298	)	$	(42,004	)	$	441,400
Currency		(480,313	)		790,640			(221,046	)
Energy		687,431			126,535			(430,320	)
Indices		(226,266	)		(566,210	)		394,694
Interest rates		16,128			188,370			(204,765	)
Metals		15,436			21,168			229,275
	$	(164,882	)	$	518,499		$	209,238