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Condensed Statement of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partners [Member]
Beginning Balances at Dec. 31, 2012 $ 99,521,782 $ 0 $ 99,521,782
Net asset value, beginning of period at Dec. 31, 2012 $ 39.81    
Addition of 500,000 partnership units 20,455,450 0 20,455,450
Redemption of 1,200,000 partnership units (48,595,161) 0 (48,595,161)
Net income 739,041 0 739,041
Ending Balances at Jun. 30, 2013 $ 72,121,112 $ 0 $ 72,121,112
Net asset value, end of period at Jun. 30, 2013 $ 40.07