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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations ASSET RETIREMENT OBLIGATIONS:
CONSOL Energy accrues for mine closing costs, perpetual water care costs, and costs associated with the plugging of degasification wells using the accounting treatment prescribed by the Asset Retirement and Environmental Obligations Topic of the FASB Accounting Standards Codification. CONSOL Energy recognizes capitalized asset retirement obligations by increasing the carrying amount of related long-lived assets.
The reconciliation of changes in the asset retirement obligations at December 31, 2019 and 2018 is as follows:
 
 
As of December 31,
 
 
2019
 
2018
Balance at Beginning of Period
 
$
267,001

 
$
258,823

Accretion Expense
 
20,116

 
19,468

Payments
 
(13,030
)
 
(8,976
)
Revisions in Estimated Cash Flows
 
(2,135
)
 
(2,314
)
Balance at End of Period
 
$
271,952

 
$
267,001