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NET INCOME PER UNIT Table (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Basic and diluted units outstanding:        
Weighted-average number of basic units outstanding 42,544,659 42,514,494 42,544,659 42,514,494
Effect of dilutive securities 41,265 0 40,464 0
Weighted-average number of diluted units outstanding 42,585,924 42,514,494 42,585,123 42,514,494