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Statement of Changes in Partners' Capital (USD $)
Total
Limited Partners
Beginning Balances at Dec. 31, 2009 $ 165,523,309 $ 165,523,309
Net Asset Value Per Unit, Beginning at Dec. 31, 2009 $ 40.37  
Addition of partnership units 2,550,000 in 2012, 2,500,000 in 2011 and 1,000,000 in 2010 39,262,000 39,262,000
Redemption of partnership units 3,950,000 in 2012, 2,800,000 in 2011 and 900,000 in 2010 (35,585,972) (35,585,972)
Net income 11,003,925 11,003,925
Ending Balances at Dec. 31, 2010 180,203,262 180,203,262
Net Asset Value Per Unit, Ending at Dec. 31, 2010 $ 42.91  
Addition of partnership units 2,550,000 in 2012, 2,500,000 in 2011 and 1,000,000 in 2010 109,084,059 109,084,059
Redemption of partnership units 3,950,000 in 2012, 2,800,000 in 2011 and 900,000 in 2010 (122,583,943) (122,583,943)
Net income 2,786,502 2,786,502
Ending Balances at Dec. 31, 2011 169,489,880 169,489,880
Net Asset Value Per Unit, Ending at Dec. 31, 2011 $ 43.46  
Addition of partnership units 2,550,000 in 2012, 2,500,000 in 2011 and 1,000,000 in 2010 101,599,752 101,599,752
Redemption of partnership units 3,950,000 in 2012, 2,800,000 in 2011 and 900,000 in 2010 (161,169,072) (161,169,072)
Net income (10,398,778) (10,398,778)
Ending Balances at Dec. 31, 2012 $ 99,521,782 $ 99,521,782
Net Asset Value Per Unit, Ending at Dec. 31, 2012 $ 39.81