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UNIT-BASED COMPENSATION PLANS - Summary of Changes in the Options Outstanding Under the Option Plan (Details) - Option Plan - Limited Partners - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Number of LP Units      
Beginning Balance (in units) 10    
Exercised (in units) (10)    
Ending Balance (in units) 0   10
Exercisable (in units) 0    
Weighted Average Strike Price per LP Unit      
Beginning Balance (in dollars per share) $ 50.36    
Exercised (in dollars per share) 0.00    
Ending Balance (in dollars per share) 0.00   $ 50.36
Exercisable (in dollars per share) $ 0.00    
Weighted Average Remaining Contractual Term (in years)      
Outstanding     1 month 6 days
Aggregate Intrinsic Value      
Outstanding $ 0   $ 151
Exercisable 0    
Additional disclosures      
Total intrinsic value of options exercised $ 200 $ 100