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Note 11 - Other Accrued Liabilities (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Accrued Liabilities [Table Text Block]
   

March 31,

   

December 31,

 
   

2022

   

2021

 

Subsidence Liability

  $ 95,059     $ 93,871  

Accrued Compensation and Benefits

    47,429       50,146  

Accrued Interest

    8,866       9,042  

Accrued Other Taxes

    5,168       5,556  

Other

    17,693       16,415  

Current Portion of Long-Term Liabilities:

               

Asset Retirement Obligations

    27,400       27,400  

Postretirement Benefits Other than Pensions

    23,452       23,638  

Pneumoconiosis Benefits

    12,328       12,398  

Workers' Compensation

    9,793       10,205  

Total Other Accrued Liabilities

  $ 247,188     $ 248,671