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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Current assets |  |
Cash and cash equivalents | $ 110,748 | $ 86,005
Trade accounts receivable | 37,940 | 25,667
Accounts receivable from affiliates | 6,638 | 5,605
Inventories | 71,488 | 54,085
Federal income tax receivable | 15,687 | 15,054
Prepaid insurance | 1,999 | 2,016
Other current assets | 15,907 | 14,621
Total current assets | 260,407 | 203,053
Property, plant and equipment, net | 217,952 | 193,167
Intangibles, net | 28,055 | 31,774
Investment in unconsolidated subsidiaries | 14,927 | 19,090
Operating lease right-of-use assets | 6,419 | 8,911
Other non-current assets | 40,312 | 51,225
Total assets | 568,072 | 507,220
Current liabilities |  |
Accounts payable | 11,952 | 12,208
Accounts payable to affiliates | 1,362 | 741
Current maturities of long-term debt | 3,649 | 2,527
Asset retirement obligations | 1,746 | 1,820
Accrued payroll | 18,105 | 16,339
Deferred revenue | 833 | 4,082
Other current liabilities | 6,623 | 8,299
Total current liabilities | 44,270 | 46,016
Long-term debt | 16,019 | 18,183
Operating lease liabilities | 7,528 | 9,733
Asset retirement obligations | 44,256 | 42,131
Pension and other postretirement obligations | 5,082 | 6,605
Deferred income taxes | 6,122 | 14,792
Liability for uncertain tax positions | 9,329 | 10,113
Other long-term liabilities | 8,500 | 7,531
Total liabilities | 141,106 | 155,104
Common stock: |  |
Capital in excess of par value | 23,706 | 16,331
Retained earnings | 404,924 | 336,778
Accumulated other comprehensive loss | (9,013) | (8,176)
Total stockholders’ equity | 426,966 | 352,116
Total liabilities and equity | 568,072 | 507,220
Class A Common Stock |  |
Common stock: |  |
Common stock | 5,783 | 5,616
Class B Common Stock |  |
Common stock: |  |
Common stock | $ 1,566 | $ 1,567

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