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Other Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Long-Term Disability Plan
CONSOL Energy has a Long-Term Disability Plan available to all eligible full-time salaried employees. The benefits for this plan are based on a percentage of monthly earnings, offset by all other income benefits available to the disabled.
 
 
For the Years Ended
 
 
December 31,
 
 
2018
 
2017
 
2016
Benefit cost
 
$
2,088

 
$
2,058

 
$
1,936

Discount rate assumption used to determine net periodic benefit costs
 
3.22
%
 
3.43
%
 
3.71
%