SUBSEQUENT EVENTS (Details) - USD ($)	Aug. 16, 2019	Jul. 25, 2019	Aug. 06, 2019	Jul. 30, 2019	May 31, 2019	Jul. 31, 2018
Subsequent Event [Line Items]
Stock and debt repurchase authorized amount						$ 100,000,000
CONSOL Coal Resources LP
Subsequent Event [Line Items]
Stock and debt repurchase additional amount authorized					$ 75,000,000
Stock and debt repurchase authorized amount					$ 175,000,000
Subsequent Event | CONSOL Coal Resources LP
Subsequent Event [Line Items]
Cash distribution declared (in dollars per share)		$ 0.5125
Stock and debt repurchase additional amount authorized				$ 25,000,000
Stock and debt repurchase authorized amount				$ 200,000,000
Stock and debt repurchase available capacity			$ 111,959,000
Consol Coal Resources LP Units
Subsequent Event [Line Items]
Stock and debt repurchase additional amount authorized						$ 25,000,000
Scenario, Forecast | Consol Coal Resources LP Units
Subsequent Event [Line Items]
Number of units converted (in shares)	11,611,067
Conversion basis (in shares)	1