Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current Assets:
Cash and Cash Equivalents	$ 331,674	$ 199,371
Short-Term Investments	84,333	81,932
Accounts and Notes Receivable
Trade Receivables, net	131,492	147,612
Other Receivables, net	13,480	12,765
Inventories	116,632	88,154
Other Current Assets	66,982	71,172
Total Current Assets	744,593	601,006
Property, Plant and Equipment:
Property, Plant and Equipment	5,701,714	5,552,404
Less - Accumulated Depreciation, Depletion and Amortization	3,792,369	3,649,281
Total Property, Plant and Equipment—Net	1,909,345	1,903,123
Other Assets:
Right of Use Asset - Operating Leases	5,846	14,658
Salary Retirement	51,933	47,246
Other Noncurrent Assets, net	112,400	108,970
Total Other Assets	170,179	170,874
TOTAL ASSETS	2,824,117	2,675,003
Current Liabilities:
Accounts Payable	145,301	137,243
Current Portion of Long-Term Debt	111,898	11,106
Operating Lease Liability, Current Portion	808	4,769
Other Accrued Liabilities	282,008	290,606
Total Current Liabilities	540,015	443,724
Long-Term Debt:
Long-Term Debt	79,336	181,885
Finance Lease Obligations	4,344	4,182
Total Long-Term Debt	83,680	186,067
Deferred Credits and Other Liabilities:
Postretirement Benefits Other Than Pensions	201,811	207,908
Pneumoconiosis Benefits	150,628	154,943
Asset Retirement Obligations	208,375	212,621
Workers’ Compensation	37,380	39,144
Salary Retirement	20,675	20,808
Operating Lease Liability	5,589	10,385
Deferred Income Taxes	36,579	36,219
Other Noncurrent Liabilities	9,890	19,742
Total Deferred Credits and Other Liabilities	670,927	701,770
TOTAL LIABILITIES	1,294,622	1,331,561
Stockholders' Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 29,394,466 Shares Issued and Outstanding at September 30, 2024; 29,910,439 Shares Issued and Outstanding at December 31, 2023	294	299
Capital in Excess of Par Value	538,054	547,861
Retained Earnings	1,138,957	944,342
Accumulated Other Comprehensive Loss	(147,810)	(149,060)
TOTAL EQUITY	1,529,495	1,343,442
TOTAL LIABILITIES AND EQUITY	$ 2,824,117	$ 2,675,003