v3.3.1.900
LONG-TERM DEBT - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 4 Months Ended 12 Months Ended
Feb. 28, 2015
Feb. 27, 2015
Oct. 31, 2015
Jan. 31, 2015
Feb. 28, 2015
Dec. 31, 2013
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Nov. 15, 2013
Long-Term Debt                    
Cash payment for contributed assets   $ 99,500           $ 99,500    
Payment for redemption of IDR units   63,000                
Payment for Redemption of Incentive Distribution Rights Units   63,000                
Repayment of credit facility   15,000                
Financing costs expense           $ 7,922   1,093 $ 180  
Interest expense           1,855   11,333 15,149  
Deferred finance costs               3,200    
Amortization of deferred financing costs           $ 202   1,613 1,861  
Azure Credit Agreement                    
Long-Term Debt                    
Interest expense         $ 2,300       $ 15,100  
Weighted average interest rate 6.50%     6.50%         6.50%  
Allocated weighted average long-term debt         192,000          
Amortization of deferred financing costs         $ 300       $ 1,900  
ETG System | Azure Credit Agreement                    
Long-Term Debt                    
Interest expense             $ 200      
Allocated weighted average long-term debt             54,400      
Amortization of deferred financing costs             $ 1,400      
Revolving Credit Facility                    
Long-Term Debt                    
Financing costs expense   3,200                
Revolving Credit Facility | Credit Agreement                    
Long-Term Debt                    
Amount outstanding   180,800                
Interest expense               6,200    
Maximum borrowing capacity   250,000                
Proceeds from Lines of Credit   $ 180,800                
Deferred finance costs               $ 3,200    
Revolving Credit Facility | Credit Agreement, Second Amendment                    
Long-Term Debt                    
Financing costs expense     $ 700              
Maximum borrowing capacity     $ 238,000              
Revolving Credit Facility | Credit Agreement, Second Amendment | Quarterly Period Ending December 31, 2015                    
Long-Term Debt                    
Maximum permitted consolidated leverage ratio     6.00%              
Revolving Credit Facility | Credit Agreement, Second Amendment | Quarterly Period ending March 31, 2016                    
Long-Term Debt                    
Maximum permitted consolidated leverage ratio     5.00%              
Revolving Credit Facility | Credit Agreement, Second Amendment | Quarterly Period ending after March 31, 2016, during Specified Acquisition Period                    
Long-Term Debt                    
Maximum permitted consolidated leverage ratio     5.00%              
Revolving Credit Facility | Credit Agreement, Second Amendment | Quarterly Period ending after March 31, 2016, outside Specified Acquisition Period                    
Long-Term Debt                    
Maximum permitted consolidated leverage ratio     4.50%              
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   2.75%                
Revolving Credit Facility | LIBOR | Maximum | Credit Agreement                    
Long-Term Debt                    
Debt instrument, basis spread on variable rate   3.75%                
Revolving Credit Facility | Base Rate | Minimum | Credit Agreement                    
Long-Term Debt                    
Debt instrument, basis spread on variable rate   1.75%                
Revolving Credit Facility | Base Rate | Maximum | Credit Agreement                    
Long-Term Debt                    
Debt instrument, basis spread on variable rate   2.75%                
Term Loan | Azure | Azure Credit Agreement                    
Long-Term Debt                    
Long-term debt                   $ 550,000