v3.5.0.2
PARTNERSHIP EQUITY AND DISTRIBUTIONS - Narrative (Details) - $ / shares
3 Months Ended 9 Months Ended
Apr. 01, 2016
Feb. 01, 2016
Aug. 06, 2015
Mar. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Partnership Equity and Distributions            
General partner units, outstanding         429,365  
General partner ownership interest (as a percent)         3.70%  
Distribution period         45 days  
Minimum quarterly distribution per unit (in dollars per share)         $ 0.35  
Annualized minimum quarterly distribution per unit (in dollars per share)         1.40  
Minimum quarterly distribution in the event that the distributions are reinstated after the temporary suspension of dividends   $ 0.35        
Common units' right to receive distributions of available cash from operating surplus each quarter before any distributions may be made on the subordinated units (in dollars per share)         $ 0.35  
Azure            
Partnership Equity and Distributions            
General partner ownership interest (as a percent)         3.70%  
NuDevco | Settlement Agreement with AES and NuDevco            
Partnership Equity and Distributions            
Number of IDR units to be surrendered (in shares) 10          
Common Units            
Partnership Equity and Distributions            
Limited partner's capital, units outstanding         11,284,341 13,044,654
Common Units | ETG System            
Partnership Equity and Distributions            
Units issued as consideration (in shares)     255,319      
Common Units | Azure            
Partnership Equity and Distributions            
Limited partner's capital, units outstanding         255,319  
Limited partner's ownership interest (as a percent)         2.30%  
Common Units | Azure | ETG System            
Partnership Equity and Distributions            
Units issued as consideration (in shares)     255,319      
Common Units | NuDevco | Settlement Agreement with AES and NuDevco            
Partnership Equity and Distributions            
Number of limited partner units surrendered (in shares 1,939,265          
Common Units | Publicly Held Units            
Partnership Equity and Distributions            
Limited partner's capital, units outstanding         11,029,022  
Limited partner's ownership interest (as a percent)         97.70%  
Subordinate Units            
Partnership Equity and Distributions            
Limited partner's capital, units outstanding         0 8,724,545
Subordinate Units | NuDevco | Settlement Agreement with AES and NuDevco            
Partnership Equity and Distributions            
Number of limited partner units surrendered (in shares 8,724,545          
Number of IDR units to be surrendered (in shares) 1,939,265          
Incentive Distribution Rights | First Target Distribution            
Partnership Equity and Distributions            
Percentage of quarterly distributions of available cash from operating surplus for distributions         13.00%  
Target distribution per unit per quarter (in dollars per share)         $ 0.4025  
Incentive Distribution Rights | Second Target Distribution            
Partnership Equity and Distributions            
Percentage of quarterly distributions of available cash from operating surplus for distributions         23.00%  
Target distribution per unit per quarter (in dollars per share)         $ 0.4375  
Incentive Distribution Rights | Third Target Distribution            
Partnership Equity and Distributions            
Percentage of quarterly distributions of available cash from operating surplus for distributions         48.00%  
Target distribution per unit per quarter (in dollars per share)         $ 0.5250  
Incentive Distribution Rights | Azure            
Partnership Equity and Distributions            
Percentage of incentive distribution rights owned         100.00%  
Incentive Distribution Rights | Maximum            
Partnership Equity and Distributions            
Percentage of quarterly distributions of available cash from operating surplus for distributions         48.00%  
Azure            
Partnership Equity and Distributions            
Other ownership interest, ownership percentage         100.00%  
General partner ownership interest (as a percent)       1.90%