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Condensed Statements of Financial Condition - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Assets    
Cash and cash equivalents (at cost $303,769,409 and $550,936,887, respectively) (Notes 2 and 5) $ 303,769,409 $ 550,936,887
Equity in trading accounts:    
Cash and cash equivalents (at cost $64,518,650 and $101,001,407, respectively) 64,518,650 101,001,407
Unrealized gain (loss) on open commodity futures contracts (356,400) 55,721,680
Dividends receivable 24,580 17,044
Interest receivable 4,714 11,573
Prepaid registration fees 119,003 158,272
ETF transaction fees receivable 1,000 2,000
Total assets 368,080,956 707,848,863
Liabilities and Partners' Capital    
Payable for shares redeemed 15,780,870 54,457,966
General Partner management fees payable (Note 3) 157,982 312,466
Professional fees payable 719,996 892,759
Brokerage commissions payable 60,300 72,800
Directors' fees and insurance payable 10,682 8,345
License fees payable 7,216 12,794
Total liabilities 16,737,046 55,757,130
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 351,343,910 652,091,733
Total Partners' Capital 351,343,910 652,091,733
Total liabilities and partners' capital $ 368,080,956 $ 707,848,863
Limited Partners' shares outstanding 15,584,588 27,941,619 [1]
Net asset value per share $ 22.54 $ 23.34 [1]
Market value per share $ 22.55 $ 23.32 [1]
[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.