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OTHER ACCRUED LIABILITIES
3 Months Ended
Mar. 31, 2018
Payables and Accruals [Abstract]  
OTHER ACCRUED LIABILITIES
OTHER ACCRUED LIABILITIES:
 
March 31,
2018
 
December 31, 2017
Subsidence Liability
$
87,633

 
$
88,027

Longwall Equipment Buyout
23,348

 
22,631

Accrued Interest
16,410

 
10,039

Accrued Payroll and Benefits
14,511

 
14,689

Litigation
10,190

 
8,197

Accrued Other Taxes
8,486

 
7,510

Equipment Lease Rental
7,839

 
9,865

Deferred Revenue
1,967

 
6,807

Short-Term Incentive Compensation
1,764

 
4,729

Other
19,959

 
23,900

Current Portion of Long-Term Liabilities:
 
 
 
Postretirement Benefits Other than Pensions
37,388

 
37,464

Asset Retirement Obligations
30,480

 
30,480

Workers' Compensation
12,912

 
13,317

Pneumoconiosis Benefits
12,245

 
12,972

Total Other Accrued Liabilities
$
285,132

 
$
290,627