Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 199,371	$ 273,070
Short-Term Investments (Note 6)	81,932	0
Accounts and Notes Receivable
Trade Receivables, net	147,612	158,127
Other Receivables, net	12,765	38,517
Inventories	88,154	66,290
Other Current Assets	71,172	62,479
Total Current Assets	601,006	598,483
Property, Plant and Equipment
Total Property, Plant and Equipment	5,552,404	5,408,577
Less—Accumulated Depreciation, Depletion and Amortization	3,649,281	3,448,495
Total Property, Plant and Equipment—Net	1,903,123	1,960,082
Other Assets:
Right of Use Asset - Operating Leases	14,658	19,799
Salary Retirement	47,246	38,548
Other Noncurrent Assets, net	108,970	87,465
Total Other Assets	170,874	145,812
TOTAL ASSETS	2,675,003	2,704,377
Current Liabilities:
Accounts Payable	137,243	130,232
Current Portion of Long, Term Debt	11,106	28,846
Operating Lease, Liability, Current Portion	4,769	4,922
Commodity Derivatives	0	15,142
Other Accrued Liabilites	290,606	269,656
Total Current Liabilities	443,724	448,798
Long-Term Debt:
Long-Term Debt	181,885	342,110
Financial Lease Obligations	4,182	13,225
Total Long-Term Debt	186,067	355,335
Deferred Credits and Other Liabilities:
Postretirement Benefits Other than Pensions	207,908	232,593
Pneumoconiosis Benefits	154,943	148,390
Asset Retirement Obligations	212,621	221,858
Workers' Compensation	39,144	40,951
Salary Retirement	20,808	20,585
Operating Lease Liability	10,385	15,073
Deferred Income Taxes	36,219	21,914
Other Noncurrent Liabilities	19,742	33,054
Total Deferred Credits and Other Liabilities	701,770	734,418
TOTAL LIABILITIES	1,331,561	1,538,551
Stockholders’ Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 29,910,439 Shares Issued and Outstanding at December 31, 2023; 34,746,904 Shares Issued and Outstanding at December 31, 2022	299	347
Capital in Excess of Par Value	547,861	646,237
Retained Earnings	944,342	668,882
Accumulated Other Comprehensive Loss	(149,060)	(149,640)
TOTAL EQUITY	1,343,442	1,165,826
TOTAL LIABILITIES AND EQUITY	$ 2,675,003	$ 2,704,377