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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 147,388,830 $ (237,461,770) $ 330,678,000 $ (392,732,210)
Change in unrealized gain (loss) on open futures contracts 101,314,400 (21,053,970) 85,850,330 (117,545,460)
Dividend income 487,147 1,035,939 770,553 1,894,828
Interest income [1] 7,348,066 4,094,212 13,643,042 7,035,151
ETF transaction fees 81,000 88,650 196,000 158,000
Total income (loss) 256,619,443 (253,296,939) 431,137,925 (501,189,691)
Expenses        
General Partner management fees (Note 3) 2,121,257 3,231,514 4,308,763 6,458,103
Professional fees 461,537 595,272 970,222 1,185,752
Brokerage commissions 652,149 1,365,114 1,346,629 2,526,521
Directors' fees and insurance 80,087 89,727 155,643 180,337
License fees 70,708 107,717 143,625 215,270
Registration fees 5,899 86,868 87,363 172,781
Total expenses 3,391,637 5,476,212 7,012,245 10,738,764
Net income (loss) $ 253,227,806 $ (258,773,151) $ 424,125,680 $ (511,928,455)
Net income (loss) per limited partnership share $ 1.92 $ (1.15) $ 2.94 $ (2.24)
Net income (loss) per weighted average limited partnership share $ 1.83 $ (0.90) $ 2.88 $ (1.86)
Weighted average limited partnership shares outstanding 138,279,121 287,768,132 147,175,138 274,777,348
[1] Interest income does not exceed paid in kind of 5%.