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Asset Impairment (Tables)
9 Months Ended
Sep. 30, 2020
Asset Impairment  
Schedule of Asset Impairment Charges [Table Text Block]

    

September 30, 

Description

2020

(In thousands)

Coal lands and mineral rights

$

33,197

Plant and equipment

 

43,197

Deferred development

50,527

Equity Investment

36,167

$

163,088