Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and Cash Equivalents	$ 408,240	$ 199,371
Short-Term Investments (Note 6)	51,993	81,932
Accounts and Notes Receivable
Trade Receivables, net	136,750	147,612
Other Receivables, net	25,900	12,765
Inventories	96,201	88,154
Other Current Assets	66,874	71,172
Total Current Assets	785,958	601,006
Property, Plant and Equipment
Total Property, Plant and Equipment	5,764,081	5,552,404
Less—Accumulated Depreciation, Depletion and Amortization	3,842,382	3,649,281
Total Property, Plant and Equipment—Net	1,921,699	1,903,123
Other Assets:
Global Water Treatment Trust Fund	5,513	14,658
Fair Value	12,054	0
Salary Retirement	41,938	47,246
Other Noncurrent Assets, net	112,381	108,970
Total Other Assets	171,886	170,874
TOTAL ASSETS	2,879,543	2,675,003
Current Liabilities:
Accounts Payable	143,635	137,243
Current Portion of Long, Term Debt	112,865	11,106
Operating Lease, Liability, Current Portion	612	4,769
Other Accrued Liabilites	261,572	290,606
Total Current Liabilities	518,684	443,724
Long-Term Debt:
Long-Term Debt	79,524	181,885
Financial Lease Obligations	15,270	4,182
Total Long-Term Debt	94,794	186,067
Deferred Credits and Other Liabilities:
Postretirement Benefits Other than Pensions	176,251	207,908
Pneumoconiosis Benefits	145,489	154,943
Asset Retirement Obligations	212,178	212,621
Workers' Compensation	36,051	39,144
Salary Retirement	20,073	20,808
Operating Lease Liability	5,466	10,385
Deferred Income Taxes	49,214	36,219
Other Noncurrent Liabilities	53,096	19,742
Total Deferred Credits and Other Liabilities	697,818	701,770
TOTAL LIABILITIES	1,311,296	1,331,561
Stockholders’ Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 29,407,830 Shares Issued and Outstanding at December 31, 2024; 29,910,439 Shares Issued and Outstanding at December 31, 2023	294	299
Capital in Excess of Par Value	540,412	547,861
Retained Earnings	1,162,114	944,342
Accumulated Other Comprehensive Loss	(134,573)	(149,060)
TOTAL EQUITY	1,568,247	1,343,442
TOTAL LIABILITIES AND EQUITY	$ 2,879,543	$ 2,675,003