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Statements of Changes in Partners' Capital - USD ($) | Total | General Partner [Member] | Limited Partners [Member]
--- | --- | --- | ---
Balances, at Dec. 31, 2014 | $ 41,419,390 | $ 0 | $ 41,419,390
Addition of partnership shares | 123,526,846 | 0 | 123,526,846
Redemption of partnership shares | (38,808,966) | 0 | (38,808,966)
Net income (loss) | (43,645,160) | 0 | (43,645,160)
Balances, at Dec. 31, 2015 | $ 82,492,110 | 0 | 82,492,110
Net asset value, beginning of year at Dec. 31, 2014 | $ 22.39 |  |
Net asset value, end of year at Dec. 31, 2015 | $ 12.22 |  |
Addition of partnership shares | $ 39,802,240 | 0 | 39,802,240
Redemption of partnership shares | (46,276,406) | 0 | (46,276,406)
Net income (loss) | 37,005,128 | 0 | 37,005,128
Balances, at Dec. 31, 2016 | $ 113,023,072 | 0 | 113,023,072
Net asset value, end of year at Dec. 31, 2016 | $ 15.7 |  |
Addition of partnership shares | $ 40,082,469 | 0 | 40,082,469
Redemption of partnership shares | (74,007,758) | 0 | (74,007,758)
Net income (loss) | 15,451,090 | 0 | 15,451,090
Balances, at Dec. 31, 2017 | $ 94,548,873 | $ 0 | $ 94,548,873
Net asset value, end of year at Dec. 31, 2017 | $ 18.18 |  |

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