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Related Party Transaction (Details) - CONSOL Energy [Member] - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Due from related parties $ 1,007 $ 12,540
Due to related parties 11,133 15,415
Total Current Liabilities [Member]    
Related Party Transaction [Line Items]    
Due to related parties 4,845 4,500
Total Deferred Credits and Other Liabilities [Member]    
Related Party Transaction [Line Items]    
Due to related parties $ 6,288 $ 10,915