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Condensed Statement in Changes in Partners' Capital (Parenthetical) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Condensed Statement in Changes in Partners' Capital (Unaudited)        
Addition of partnership shares 0 50,000 28,750,000 100,000
Redemption of partnership unit shares 4,650,000   17,100,000 400,000