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Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
ASSETS |  |
Cash and cash equivalents | $ 97,113 | $ 86,005
Trade accounts receivable | 32,143 | 25,667
Accounts receivable from affiliates | 6,427 | 5,605
Inventories | 56,956 | 54,085
Refundable federal income taxes | 3,919 | 15,054
Prepaid insurance | 7,766 | 2,016
Other current assets | 14,252 | 14,621
Total current assets | 218,576 | 203,053
Property, plant and equipment, net | 210,470 | 193,167
Intangibles, net | 29,868 | 31,774
Operating lease right-of-use assets | 8,250 | 8,911
Other non-current assets | 47,019 | 46,225
Total assets | 547,344 | 507,220
LIABILITIES AND EQUITY |  |
Accounts payable | 16,490 | 12,208
Accounts payable to affiliates | 885 | 741
Current maturities of long-term debt | 2,929 | 2,527
Asset retirement obligations | 1,820 | 1,820
Accrued payroll | 11,281 | 16,339
Deferred revenue | 1,803 | 4,082
Other current liabilities | 8,430 | 8,299
Total current liabilities | 43,638 | 46,016
Long-term debt | 15,498 | 18,183
Operating lease liabilities | 9,214 | 9,733
Asset retirement obligations | 42,873 | 42,131
Pension and other postretirement obligations | 5,422 | 6,605
Deferred income taxes | 10,808 | 14,792
Liability for uncertain tax positions | 10,113 | 10,113
Other long-term liabilities | 7,175 | 7,531
Total liabilities | 144,741 | 155,104
Common stock: |  |
Capital in excess of par value | 19,634 | 16,331
Retained earnings | 383,574 | 336,778
Accumulated other comprehensive loss | (7,940) | (8,176)
Total stockholders' equity | 402,603 | 352,116
Total liabilities and equity | 547,344 | 507,220
Unconsolidated Subsidiaries |  |
ASSETS |  |
Investments in unconsolidated subsidiaries | 15,379 | 19,090
Private Company Equity |  |
ASSETS |  |
Investments in unconsolidated subsidiaries | 17,782 | 5,000
Class A Common Stock |  |
Common stock: |  |
Common stock | 5,769 | 5,616
Class B Common Stock |  |
Common stock: |  |
Common stock | $ 1,566 | $ 1,567

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