NET INCOME PER UNIT Table (Details)	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Basic and diluted units outstanding:
Weighted-average number of basic units outstanding	42,574,419	42,544,659
Effect of dilutive securities	23,222	39,654
Weighted-average number of diluted units outstanding	42,597,641	42,584,313

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details