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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (237,461,770) $ 719,826,560 $ (392,732,210) $ 504,268,950
Change in unrealized gain (loss) on open futures contracts (21,053,970) (74,855,450) (117,545,460) (33,328,530)
Dividend income 1,035,939 572,471 1,894,828 920,883
Interest income 4,094,212 2,323,518 7,035,151 4,068,781
ETF transaction fees 88,650 69,000 158,000 154,000
Total income (loss) (253,296,939) 647,936,099 (501,189,691) 476,084,084
Expenses        
General Partner management fees (Note 3) 3,231,514 3,924,293 6,458,103 7,843,623
Professional fees 595,272 673,118 1,185,752 1,346,433
Brokerage commissions 1,365,114 1,603,540 2,526,521 3,832,708
Directors' fees and insurance 89,727 94,090 180,337 181,641
License fees 107,717 130,810 215,270 261,454
Registration fees 86,868 83,367 172,781 164,336
Total expenses 5,476,212 6,509,218 10,738,764 13,630,195
Net income (loss) $ (258,773,151) $ 641,426,881 $ (511,928,455) $ 462,453,889
Net income (loss) per limited partnership share $ (1.15) $ 1.82 $ (2.24) $ 0.54
Net income (loss) per weighted average limited partnership share $ (0.9) $ 2.03 $ (1.86) $ 1.34
Weighted average limited partnership shares outstanding 287,768,132 316,056,044 274,777,348 345,501,648