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Statements of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partners
Beginning Balances at Dec. 31, 2010 $ 180,203,262 $ 0 $ 180,203,262
Net Asset Value Per Share, Beginning at Dec. 31, 2010 $ 42.91    
Addition of partnership shares 650,000 in 2013, 2,550,000 in 2012 and 2,500,000 in 2011 109,084,059 0 109,084,059
Redemption of partnership shares 1,700,000 in 2013, 3,950,000 in 2012 and 2,800,000 in 2011 (122,583,943) 0 (122,583,943)
Net income 2,786,502 0 2,786,502
Ending Balances at Dec. 31, 2011 169,489,880 0 169,489,880
Net Asset Value Per Share, Ending at Dec. 31, 2011 $ 43.46    
Addition of partnership shares 650,000 in 2013, 2,550,000 in 2012 and 2,500,000 in 2011 101,599,752 0 101,599,752
Redemption of partnership shares 1,700,000 in 2013, 3,950,000 in 2012 and 2,800,000 in 2011 (161,169,072) 0 (161,169,072)
Net income (10,398,778) 0 (10,398,778)
Ending Balances at Dec. 31, 2012 99,521,782 0 99,521,782
Net Asset Value Per Share, Ending at Dec. 31, 2012 $ 39.81    
Addition of partnership shares 650,000 in 2013, 2,550,000 in 2012 and 2,500,000 in 2011 26,960,147 0 26,960,147
Redemption of partnership shares 1,700,000 in 2013, 3,950,000 in 2012 and 2,800,000 in 2011 (69,955,807) 0 (69,955,807)
Net income 5,578,244 0 5,578,244
Ending Balances at Dec. 31, 2013 $ 62,104,366 $ 0 $ 62,104,366
Net Asset Value Per Share, Ending at Dec. 31, 2013 $ 42.83