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Condensed Statement of Changes in Partners' Capital (Parenthetical)
 3 Months Ended
Mar. 31, 2018
shares
Addition of partnership units 19,600,000
Redemption of partnership units 31,957,031 [1]
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.