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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (215,557,610) $ (324,511,450)
Change in unrealized gain (loss) on open futures contracts 41,526,920 51,633,790
Dividend income 348,412 16,217
Interest income 1,745,263 194,598
ETF transaction fees 85,000 95,000
Total income (loss) (171,852,015) (272,571,845)
Expenses    
General Partner management fees (Note 3) 3,919,330 2,557,917
Professional fees 673,315 214,577
Brokerage commissions 2,229,168 1,187,217
Directors' fees and insurance 87,551 68,084
License fees 130,644 85,264
Registration fees 80,969 5,339
Total expenses 7,120,977 4,118,398
Net income (loss) $ (178,972,992) $ (276,690,243)
Net income (loss) per limited partnership share (in dollars per share) $ (1.28) $ (3.28)
Net income (loss) per weighted average limited partnership share (in dollars per share) $ (0.48) $ (2.16)
Weighted average limited partnership shares outstanding (in shares) 374,947,253 128,206,667