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Condensed Statement of Changes in Partners' Capital - USD ($)
Total
General Partner [Member]
Limited Partners [Member]
Net income (loss) $ (140,098,159)    
Net asset value, beginning of period at Dec. 31, 2016 [1] $ 37.18    
Net asset value, end of period at Jun. 30, 2017 [1] $ 27.13    
Balances at Dec. 31, 2017 $ 652,091,733 $ 0 $ 652,091,733
Addition of partnership shares 841,684,628 0 841,684,628
Redemption of partnership shares (1,187,879,690) 0 (1,187,879,690)
Net income (loss) 30,431,939 0 30,431,939
Balances at Jun. 30, 2018 $ 336,328,610 $ 0 $ 336,328,610
Net asset value, beginning of period at Dec. 31, 2017 [1] $ 23.34    
Net asset value, end of period at Jun. 30, 2018 $ 23.71    
[1] On January 4, 2018, there was a 1-for-4 reverse share split. Historical shares outstanding, net asset value per share and market value per share have been adjusted to reflect the 1-for-4 reverse share split on a retroactive basis.