Statements Of Financial Highlights		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	(2.18%)	(1.64%)
Total expenses	[1]	3.95%	3.88%
Profit share allocation	[2]	0.00%	0.23%
Total expenses and profit share allocation		3.95%	4.11%
Total return before profit share allocation	[2]	(16.88%)	1.26%
Less: profit share allocation	[2]	0.00%	0.23%
Total return after profit share allocation		(16.88%)	1.03%
Special Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	0.68%	1.32%
Total expenses	[1]	1.08%	0.92%
Profit share allocation	[2]	0.00%	0.00%
Total expenses and profit share allocation		1.08%	0.92%
Total return before profit share allocation	[2]	(16.28%)	2.01%
Less: profit share allocation	[2]	0.00%	0.00%
Total return after profit share allocation		(16.28%)	2.01%

[1] annualized

[2] not annualized