v3.5.0.2
LONG-TERM DEBT - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2016
Apr. 01, 2016
Feb. 27, 2015
Oct. 31, 2015
Feb. 28, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Nov. 15, 2013
Long-Term Debt                        
Amount outstanding                 $ 15,000      
Cash payment for contributed assets                   $ 99,500    
Financing costs expense                   272    
Interest expense           $ 3,153 $ 3,225   6,154 6,698    
Amount of debt that will become due and payable if the Partnership remains out of compliance with all of the restrictive covenants under the Credit Agreement $ 214,500         214,500     214,500      
Amortization of deferred financing costs                 980 $ 823    
Azure Credit Agreement                        
Long-Term Debt                        
Interest expense         $ 2,300              
Weighted average interest rate         6.50%              
Allocated weighted average long-term debt         $ 192,000              
Amortization of deferred financing costs         $ 300              
Settlement Agreement with AES and NuDevco                        
Long-Term Debt                        
Proceeds from issuance of letter of credit, used to pay down debt under Credit Agreement   $ 15,000                    
ETG System | Azure Credit Agreement                        
Long-Term Debt                        
Interest expense             1,200 $ 1,700        
Allocated weighted average long-term debt               54,400        
Amortization of deferred financing costs             200 200        
Revolving Credit Facility | Credit Agreement                        
Long-Term Debt                        
Interest expense           2,600 $ 1,700 $ 2,300 5,200      
Deferred loan costs 2,281         2,281     2,281   $ 3,261  
Revolving Credit Facility | Credit Agreement, Second Amendment                        
Long-Term Debt                        
Financing costs expense       $ 700                
Maximum borrowing capacity       $ 238,000                
Revolving Credit Facility | Credit Agreement, Fourth Amendment                        
Long-Term Debt                        
Financing costs expense 900                      
Maximum borrowing capacity 214,700         214,700     214,700      
Amount of debt that will become due and payable if the Partnership remains out of compliance with all of the restrictive covenants under the Credit Agreement $ 214,500         $ 214,500     $ 214,500      
Revolving Credit Facility | Azure | Azure Credit Agreement                        
Long-Term Debt                        
Long-term debt                       $ 50,000
Revolving Credit Facility | LIBOR | Minimum | Credit Agreement                        
Long-Term Debt                        
Debt instrument, basis spread on variable rate     3.25%                  
Revolving Credit Facility | LIBOR | Maximum | Credit Agreement                        
Long-Term Debt                        
Debt instrument, basis spread on variable rate     4.25%                  
Revolving Credit Facility | Base Rate | Minimum | Credit Agreement                        
Long-Term Debt                        
Debt instrument, basis spread on variable rate     2.25%                  
Revolving Credit Facility | Base Rate | Maximum | Credit Agreement                        
Long-Term Debt                        
Debt instrument, basis spread on variable rate     3.25%                  
Term Loan | Azure | Azure Credit Agreement                        
Long-Term Debt                        
Long-term debt                       $ 550,000