2.4.0.8080400 - Disclosure - Financial Instruments (Tables)truefalsefalse1false falsefalsec20130101to20130630http://www.sec.gov/CIK0001097396duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_InvestmentsAllOtherInvestmentsAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Financial Instruments [Abstract]2false 2us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><div style="text-align: justify; font-family: Times New Roman; color: #000000; font-size: 10pt; margin-right: 12pt;">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:</div><div><div style="text-align: justify; font-family: Times New Roman; 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