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Condensed Statements of Financial Condition - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Assets    
Cash and cash equivalents (Notes 2 and 5) $ 437,239,552 $ 522,819,857
Equity in trading accounts:    
Cash and cash equivalents 44,975,772 44,966,225
Unrealized gain (loss) on open commodity futures contracts 22,140,010 37,435,507
Receivable for shares sold 0 4,646,990
Dividends receivable 3,011 14,954
Directors' fees and insurance receivable 14,015 0
Prepaid registration fees 105,340 187,798
ETF transaction fees receivable 2,000 2,000
Total assets 504,479,700 610,073,331
Liabilities and Partners' Capital    
Payable due to Broker 20,476,398 44,770,339
Payable for shares redeemed 22,786,989 26,641,069
General Partner management fees payable (Note 3) 248,103 303,354
Professional fees payable 181,027 437,218
Brokerage commissions payable 72,800 85,200
Directors' fees and insurance payable 0 5,417
License fees payable 9,073 19,932
Total liabilities 43,774,390 72,262,529
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital    
General Partner 0 0
Limited Partners 460,705,310 537,810,802
Total Partners' Capital 460,705,310 537,810,802
Total liabilities and partners' capital $ 504,479,700 $ 610,073,331
Limited Partners' shares outstanding 60,866,476 57,866,476
Net asset value per share $ 7.57 $ 9.29
Market value per share $ 7.57 $ 9.34