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UNIT-BASED AND NONCASH COMPENSATION - SMP Net Profits Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unit-based compensation $ 6,174 $ 4,696 $ 2,999  
SMP Net Profits Interests        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Portion of membership interests authorized for issuance, percent       7.50%
Award vesting period 5 years      
Unit-based compensation $ 800 $ 1,100 $ 1,200