Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
ASSETS
Cash and cash equivalents	$ 92,754	$ 86,005
Trade accounts receivable	23,603	25,667
Accounts receivable from affiliates	6,672	5,605
Inventories	61,799	54,085
Federal income tax receivable	23,046	15,054
Prepaid insurance	4,249	2,016
Other current assets	17,156	14,621
Total current assets	229,279	203,053
Property, plant and equipment, net	213,435	193,167
Intangibles, net	29,001	31,774
Operating lease right-of-use assets	7,912	8,911
Other non-current assets	50,766	46,225
Total assets	560,204	507,220
LIABILITIES AND EQUITY
Accounts payable	11,371	12,208
Accounts payable to affiliates	699	741
Current maturities of long-term debt	2,955	2,527
Asset retirement obligations	1,820	1,820
Accrued payroll	16,640	16,339
Deferred revenue	1,334	4,082
Other current liabilities	9,150	8,299
Total current liabilities	43,969	46,016
Long-term debt	15,322	18,183
Operating lease liabilities	8,944	9,733
Asset retirement obligations	43,326	42,131
Pension and other postretirement obligations	4,943	6,605
Deferred income taxes	11,299	14,792
Liability for uncertain tax positions	9,280	10,113
Other long-term liabilities	7,700	7,531
Total liabilities	144,783	155,104
Common stock:
Capital in excess of par value	23,235	16,331
Retained earnings	392,666	336,778
Accumulated other comprehensive loss	(7,822)	(8,176)
Total stockholders' equity	415,421	352,116
Total liabilities and equity	560,204	507,220
Unconsolidated Subsidiaries
ASSETS
Investments in unconsolidated subsidiaries	9,853	19,090
Private Company Equity
ASSETS
Investments in unconsolidated subsidiaries	19,958	5,000
Class A Common Stock
Common stock:
Common stock	5,776	5,616
Class B Common Stock
Common stock:
Common stock	$ 1,566	$ 1,567