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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes and EPS (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
May 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Accounting Policies [Line Items]          
Deferred tax liability, noncurrent     $ 0.6 $ 1.6  
General partner          
Significant Accounting Policies [Line Items]          
General partner interest (as a percent) 2.00% 2.00% 2.00% 2.00% 2.00%