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NET INCOME PER UNIT
 12 Months Ended
Dec. 31, 2012
NET INCOME PER UNIT [Abstract]  
NET INCOME PER UNIT
NET INCOME PER UNIT
Net Income Per Unit
We treat restricted units granted under our long-term incentive plan as participating securities in computing net income per unit pursuant to the two-class method. Unit amounts used in the computation of basic and diluted net income per unit were as follows:
 
 
Year Ended December 31,
 
2012
 
2011
 
2010
Basic units outstanding:
 
 
 
 
 
Weighted-average number of basic units outstanding
42,576,858

 
42,546,096

 
42,517,525

Diluted units outstanding:
 
 
 
 
 
Weighted-average number of basic units outstanding
42,576,858

 
42,546,096

 
42,517,525

Effect of dilutive securities
7,809

 
26,521

 
8,662

Weighted-average number of diluted units outstanding
42,584,667

 
42,572,617

 
42,526,187