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Statements of Changes in Partners' Capital (Parenthetical)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Addition of partnership shares, shares 650,000 2,550,000 2,500,000
Redemption of partnership shares, shares 1,700,000 3,950,000 2,800,000