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Property, Plant and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment, Net [Abstract]  
Property, Plant and Equipment
Property, plant and equipment, net includes the following:
 
December 31
 
2019
 
2018
Coal lands and real estate
$
54,647

 
$
56,716

Plant and equipment
190,868

 
163,564

Property, plant and equipment, at cost
245,515

 
220,280

Less allowances for depreciation, depletion and amortization
107,454

 
95,726

 
$
138,061

 
$
124,554