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RELATED PARTY TRANSACTIONS (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employment and Severance Agreements
     
Related party transactions      
Number of executives 3    
Managing general partner
     
Related party transactions      
Management fee as a percentage of operating cash flow 2.00%    
Annual incentive fee as a percentage of aggregate fair market value of Class A units 0.50%    
Incentive fee earned $ 0 $ 0 $ 0
Dennis J.Simonis | Employment and Severance Agreements
     
Related party transactions      
Period of base pay used to calculate severance payable 24 months    
Dennis J.Simonis | Employment and Severance Agreements | Maximum
     
Related party transactions      
Amount of severance payable as per the agreement that includes other than for Just Cause 536,000    
Randolph H. Cabral | Employment and Severance Agreements
     
Related party transactions      
Period of base pay used to calculate severance payable 18 months    
Amount of severance payable as per the agreement that includes other than for Just Cause 222,000    
Scott C. Wallace | Employment and Severance Agreements
     
Related party transactions      
Amount of severance payable as per the agreement that includes other than for Just Cause $ 125,000    
Scott C. Wallace | Employment and Severance Agreements | Minimum
     
Related party transactions      
Period of base pay used to calculate severance payable 6 months