Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 189,539	$ 273,070
Short-Term Investments	100,699	0
Accounts and Notes Receivable
Trade Receivables, net	113,825	158,127
Other Receivables, net	10,349	38,517
Inventories	97,675	66,290
Other Current Assets	66,337	62,479
Total Current Assets	578,424	598,483
Property, Plant and Equipment:
Property, Plant and Equipment	5,484,648	5,408,577
Less - Accumulated Depreciation, Depletion and Amortization	3,553,045	3,448,495
Total Property, Plant and Equipment—Net	1,931,603	1,960,082
Other Assets:
Right of Use Asset - Operating Leases	16,910	19,799
Salary Retirement	44,797	38,548
Other Noncurrent Assets, net	106,615	87,465
Total Other Assets	168,322	145,812
TOTAL ASSETS	2,678,349	2,704,377
Current Liabilities:
Accounts Payable	122,015	130,232
Current Portion of Long-Term Debt	19,182	28,846
Operating Lease Liability, Current Portion	4,775	4,922
Commodity Derivatives	0	15,142
Other Accrued Liabilities	267,759	269,656
Total Current Liabilities	413,731	448,798
Long-Term Debt:
Long-Term Debt	207,464	342,110
Finance Lease Obligations	7,299	13,225
Total Long-Term Debt	214,763	355,335
Deferred Credits and Other Liabilities:
Postretirement Benefits Other Than Pensions	228,830	232,593
Pneumoconiosis Benefits	146,033	148,390
Asset Retirement Obligations	223,775	221,858
Workers’ Compensation	41,433	40,951
Salary Retirement	20,552	20,585
Operating Lease Liability	12,491	15,073
Deferred Income Taxes	21,353	21,914
Other Noncurrent Liabilities	20,193	33,054
Total Deferred Credits and Other Liabilities	714,660	734,418
TOTAL LIABILITIES	1,343,154	1,538,551
Stockholders' Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 32,698,939 Shares Issued and Outstanding at June 30, 2023; 34,746,904 Shares Issued and Outstanding at December 31, 2022	327	347
Capital in Excess of Par Value	595,566	646,237
Retained Earnings	890,786	668,882
Accumulated Other Comprehensive Loss	(151,484)	(149,640)
TOTAL EQUITY	1,335,195	1,165,826
TOTAL LIABILITIES AND EQUITY	$ 2,678,349	$ 2,704,377