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Condensed Statement of Changes in Partners' Capital - USD ($)
General Partner [Member]
Limited Partners [Member]
Total
Net income (loss)     $ 50,003,562
Net asset value, beginning of period at Dec. 31, 2017 [1]     $ 23.34
Net asset value, end of period at Sep. 30, 2018     $ 24.86
Balances at Dec. 31, 2018 $ 0 $ 248,014,523 $ 248,014,523
Addition of 24,000,000 partnership shares 0 533,947,245 533,947,245
Redemption of 21,300,000 partnership shares 0 (499,942,062) (499,942,062)
Net income (loss) 0 (25,187,996) (25,187,996)
Balances at Sep. 30, 2019 $ 0 $ 256,831,710 $ 256,831,710
Net asset value, beginning of period at Dec. 31, 2018     $ 24.35
Net asset value, end of period at Sep. 30, 2019     $ 19.93
[1] On January 4, 2018, there was a 1for4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted for the period shown to reflect the 1for4 reverse share split on a retroactive basis.