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Condensed Statement in Changes in Partners' Capital (Parenthetical) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Condensed Statement in Changes in Partners' Capital        
Addition of partnership unit shares 26,600,000   28,750,000 50,000
Redemption of partnership unit shares 12,300,000 300,000 12,450,000 400,000