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Condensed Statement of Changes in Partners' Capital - USD ($)
General Partner [Member]
Limited Partners [Member]
Total
Net income (loss)     $ 30,431,939
Net asset value, beginning of period at Dec. 31, 2017     $ 23.34
Net asset value, end of period at Jun. 30, 2018     $ 23.71
Balances at Dec. 31, 2018 $ 0 $ 248,014,523 $ 248,014,523
Addition of 19,400,000 partnership shares 0 446,533,840 446,533,840
Redemption of 13,200,000 partnership shares 0 (328,322,177) (328,322,177)
Net income (loss) 0 (41,285,033) (41,285,033)
Balances at Jun. 30, 2019 $ 0 $ 324,941,153 $ 324,941,153
Net asset value, beginning of period at Dec. 31, 2018     $ 24.35
Net asset value, end of period at Jun. 30, 2019     $ 19.83