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Statement of Changes in Partners' Capital (Parenthetical) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Changes in Partners' Capital      
Addition of partnership shares 28,750,000 100,000 0
Redemption of partnership unit shares (19,750,000) (550,000) (1,500,000)