Net Income Per Unit Net Income Per Unit (Policies)	9 Months Ended
Net Income Per Unit Net Income Per Unit (Policies)	Sep. 30, 2013
Net Income Per Unit [Abstract]
Earnings Per Share, Policy [Policy Text Block]	We use the two-class method when calculating the net income per unit applicable to limited partners because we have more than one participating security. The two-class method is based on the weighted-average number of common units outstanding during the period. Basic net income per unit applicable to limited partners (including subordinated unitholders) is computed by dividing limited partners’ interest in net income, after deducting our general partner’s 2% interest and incentive distributions, if any, by the weighted-average number of outstanding common and subordinated units. Our net income is allocated to our general partner and limited partners in accordance with their respective partnership percentages after giving effect to priority income allocations for incentive distributions, if any, to our general partner, which is the holder of the incentive distribution rights pursuant to our partnership agreement, which are declared and paid following the close of each quarter.

Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security. Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.

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