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ACQUISITIONS - Schedule of Assets Acquired and Liabilities Assumed ETG System (Details) - USD ($)
$ in Thousands
2 Months Ended 12 Months Ended
Aug. 06, 2015
Dec. 31, 2013
Dec. 31, 2015
Consideration for the ETG System:      
Cash   $ 212,515 $ 76,191
Issuance of 255,319 common units     3,000
Assets acquired and liabilities assumed:      
Excess of consideration over net assets acquired     $ 6,809
Common Units      
Assets acquired and liabilities assumed:      
Issuance of common units in connection with the Contribution Agreement     255,319
ETG System      
Consideration for the ETG System:      
Cash $ 80,000    
Issuance of 255,319 common units 3,000    
Total Consideration 83,000    
Assets acquired and liabilities assumed:      
Current assets 11    
Property, plant and equipment 87,594    
Deferred tax asset 211    
Other long-term liabilities (11,625)    
Net assets acquired 76,191    
Excess of consideration over net assets acquired $ 6,809    
ETG System | Common Units      
Assets acquired and liabilities assumed:      
Issuance of common units in connection with the Contribution Agreement 255,319