Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 167,586	$ 273,070
Short-Term Investments	81,009	0
Accounts and Notes Receivable
Trade Receivables, net	147,664	158,127
Other Receivables, net	11,317	38,517
Inventories	98,386	66,290
Other Current Assets	73,432	62,479
Total Current Assets	579,394	598,483
Property, Plant and Equipment:
Property, Plant and Equipment	5,520,656	5,408,577
Less - Accumulated Depreciation, Depletion and Amortization	3,603,830	3,448,495
Total Property, Plant and Equipment—Net	1,916,826	1,960,082
Other Assets:
Right of Use Asset - Operating Leases	15,660	19,799
Salary Retirement	47,921	38,548
Other Noncurrent Assets, net	99,714	87,465
Total Other Assets	163,295	145,812
TOTAL ASSETS	2,659,515	2,704,377
Current Liabilities:
Accounts Payable	132,377	130,232
Current Portion of Long-Term Debt	15,623	28,846
Operating Lease Liability, Current Portion	4,854	4,922
Commodity Derivatives	0	15,142
Other Accrued Liabilities	301,297	269,656
Total Current Liabilities	454,151	448,798
Long-Term Debt:
Long-Term Debt	183,421	342,110
Finance Lease Obligations	5,405	13,225
Total Long-Term Debt	188,826	355,335
Deferred Credits and Other Liabilities:
Postretirement Benefits Other Than Pensions	226,645	232,593
Pneumoconiosis Benefits	145,146	148,390
Asset Retirement Obligations	221,011	221,858
Workers’ Compensation	42,220	40,951
Salary Retirement	20,536	20,585
Operating Lease Liability	11,232	15,073
Deferred Income Taxes	21,077	21,914
Other Noncurrent Liabilities	19,881	33,054
Total Deferred Credits and Other Liabilities	707,748	734,418
TOTAL LIABILITIES	1,350,725	1,538,551
Stockholders' Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 31,152,797 Shares Issued and Outstanding at September 30, 2023; 34,746,904 Shares Issued and Outstanding at December 31, 2022	312	347
Capital in Excess of Par Value	569,071	646,237
Retained Earnings	891,798	668,882
Accumulated Other Comprehensive Loss	(152,391)	(149,640)
TOTAL EQUITY	1,308,790	1,165,826
TOTAL LIABILITIES AND EQUITY	$ 2,659,515	$ 2,704,377