Statements Of Financial Highlights		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	(2.75%)	(1.50%)	(2.46%)	(1.56%)
Total expenses	[1]	3.93%	3.89%	3.95%	3.88%
Profit share allocation	[2]	0.00%	0.01%	0.00%	0.24%
Total expenses and profit share allocation		3.93%	3.90%	3.95%	4.12%
Total return before profit share allocation	[2]	1.81%	0.08%	(15.38%)	1.35%
Less: profit share allocation	[2]	0.00%	0.01%	0.00%	0.24%
Total return after profit share allocation		1.81%	0.07%	(15.38%)	1.11%
Special Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	0.20%	1.40%	0.45%	1.36%
Total expenses	[1]	0.97%	0.98%	1.03%	0.95%
Profit share allocation	[2]	0.00%	0.00%	0.00%	0.00%
Total expenses and profit share allocation		0.97%	0.98%	1.03%	0.95%
Total return before profit share allocation	[2]	2.56%	0.83%	(14.14%)	2.86%
Less: profit share allocation	[2]	0.00%	0.00%	0.00%	0.00%
Total return after profit share allocation		2.56%	0.83%	(14.14%)	2.86%

[1] Annualized

[2] Not Annualized