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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2013
Net Unrealized Gains And Losses on Open Contracts, Disclosures [Line Items]  
Net Unrealized Gain (Loss) on Open Contracts
The net unrealized gains (losses) on open contracts, reported as a component of “Trading Equity” on the Statements of Financial Condition, and their longest contract maturities were as follows:
 
 
Net Unrealized Gains (Losses) on Open Contracts
Longest Maturities
Date
Exchange-Traded
 Off-Exchange-Traded
Total
Exchange-Traded
Off-Exchange-Traded
$
$
$
Sep. 30, 2013
  
(2,865,558
)
  
(16,615
)
  
(2,882,173
)
Dec. 2014
Dec. 2013
Dec. 31, 2012
  
(2,010,679
)
  
905,178
   
(1,105,501
)
Sep. 2014
Mar. 2013