Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and Cash Equivalents	$ 192,826	$ 273,070
Short-Term Investments	75,310	0
Restricted Cash - Current	45,797	40,366
Accounts and Notes Receivable
Trade Receivables, net	149,404	158,127
Other Receivables, net	36,209	38,517
Inventories	95,635	66,290
Prepaid Expenses	16,807	22,113
Total Current Assets	611,988	598,483
Property, Plant and Equipment:
Property, Plant and Equipment	5,442,735	5,408,577
Less - Accumulated Depreciation, Depletion and Amortization	3,502,386	3,448,495
Total Property, Plant and Equipment—Net	1,940,349	1,960,082
Other Assets:
Right of Use Asset - Operating Leases	18,267	19,799
Restricted Cash - Non-current	8,220	13,516
Salary Retirement	41,672	38,548
Other Noncurrent Assets, net	74,815	73,949
Total Other Assets	142,974	145,812
TOTAL ASSETS	2,695,311	2,704,377
Current Liabilities:
Accounts Payable	120,539	130,232
Current Portion of Long-Term Debt	24,580	28,846
Operating Lease Liability, Current Portion	4,820	4,922
Commodity Derivatives	0	15,142
Other Accrued Liabilities	292,527	269,656
Total Current Liabilities	442,466	448,798
Long-Term Debt:
Long-Term Debt	252,977	342,110
Finance Lease Obligations	10,064	13,225
Total Long-Term Debt	263,041	355,335
Deferred Credits and Other Liabilities:
Postretirement Benefits Other Than Pensions	231,043	232,593
Pneumoconiosis Benefits	147,322	148,390
Asset Retirement Obligations	221,174	221,858
Workers’ Compensation	41,558	40,951
Salary Retirement	20,568	20,585
Operating Lease Liability	13,731	15,073
Deferred Income Taxes	21,704	21,914
Other Noncurrent Liabilities	11,807	33,054
Total Deferred Credits and Other Liabilities	708,907	734,418
TOTAL LIABILITIES	1,414,414	1,538,551
Stockholders' Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 33,872,287 Shares Issued and Outstanding at March 31, 2023; 34,746,904 Shares Issued and Outstanding at December 31, 2022	339	347
Capital in Excess of Par Value	615,872	646,237
Retained Earnings	815,015	668,882
Accumulated Other Comprehensive Loss	(150,329)	(149,640)
TOTAL EQUITY	1,280,897	1,165,826
TOTAL LIABILITIES AND EQUITY	$ 2,695,311	$ 2,704,377