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Related Party Transaction (Details) - CONSOL Energy [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Account payable to related parties	$ 75
Due from related parties		$ 12,540
Due to related parties	11,351	15,415
Total Current Liabilities [Member]
Related Party Transaction [Line Items]
Due to related parties	5,063	4,500
Total Deferred Credits and Other Liabilities [Member]
Related Party Transaction [Line Items]
Due to related parties	$ 6,288	$ 10,915

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