Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and Cash Equivalents	$ 149,913	$ 50,850
Restricted Cash - Current	32,605	0
Accounts and Notes Receivable
Trade Receivables, net	104,099	118,289
Other Receivables, net	11,631	42,157
Inventories (Note 9)	62,876	56,200
Prepaid Expenses and Other Assets	25,216	25,445
Total Current Assets	386,340	292,941
Property, Plant and Equipment (Note 10):
Property, Plant and Equipment	5,250,805	5,143,696
Less—Accumulated Depreciation, Depletion and Amortization	3,272,255	3,094,634
Total Property, Plant and Equipment—Net	1,978,550	2,049,062
Other Assets:
Deferred Income Taxes (Note 6)	57,011	68,821
Right of Use Asset - Operating Leases (Note 14)	21,956	53,436
Restricted Cash - Non-current	15,688	0
Salary Retirement (Note 15)	38,947	0
Other, net	75,025	59,106
Total Other Assets	208,627	181,363
TOTAL ASSETS	2,573,517	2,523,366
Current Liabilities:
Accounts Payable	80,343	71,229
Current Portion of Long-Term Debt (Note 13)	57,332	53,846
Operating Lease Liability (Note 14)	6,682	20,241
Other Accrued Liabilities (Note 12)	300,875	223,154
Total Current Liabilities	445,232	368,470
Long-Term Debt:
Long-Term Debt (Note 13)	568,052	566,858
Finance Lease Obligations (Note 14)	26,598	36,203
Total Long-Term Debt	594,650	603,061
Deferred Credits and Other Liabilities:
Postretirement Benefits Other Than Pensions (Note 15)	329,659	387,637
Pneumoconiosis Benefits (Note 16)	203,473	229,720
Asset Retirement Obligations (Note 8)	210,718	228,182
Workers’ Compensation (Note 16)	58,148	64,390
Salary Retirement Liability (Note 15)	26,013	35,359
Operating Lease Liability (Note 14)	15,274	35,655
Other	17,537	17,373
Total Deferred Credits and Other Liabilities	860,822	998,316
TOTAL LIABILITIES	1,900,704	1,969,847
Stockholders’ Equity:
Common Stock, $0.01 Par Value; 62,500,000 Shares Authorized, 34,480,181 Shares Issued and Outstanding at December 31, 2021; 34,031,374 Shares Issued and Outstanding at December 31, 2020	345	340
Capital in Excess of Par Value	646,945	642,887
Retained Earnings	280,960	246,850
Accumulated Other Comprehensive Loss	(255,437)	(336,558)
TOTAL EQUITY	672,813	553,519
TOTAL LIABILITIES AND EQUITY	$ 2,573,517	$ 2,523,366