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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 86,005 $ 88,450
Trade accounts receivable 25,667 18,894
Accounts receivable from affiliates 5,605 4,764
Inventories 54,085 47,551
Refundable federal income taxes 15,054 17,615
Prepaid insurance 2,016 2,564
Other current assets 14,621 8,308
Total current assets 203,053 188,146
Property, plant and equipment, net 193,167 172,417
Intangibles, net 31,774 35,330
Investment in unconsolidated subsidiaries 19,090 28,978
Operating lease right-of-use assets 8,911 10,324
Other non-current assets 51,225 40,984
Total assets 507,220 476,179
Current liabilities    
Accounts payable 12,208 5,522
Accounts payable to affiliates 741 125
Revolving credit agreements 0 20,000
Current portion of borrowings outstanding 2,527 2,112
Asset retirement obligations 1,820 1,844
Accrued payroll 16,339 14,430
Deferred revenue 4,082 941
Other current liabilities 8,299 7,283
Total current liabilities 46,016 52,257
Long-term debt 18,183 24,353
Operating lease liabilities 9,733 11,196
Asset retirement obligations 42,131 39,888
Pension and other postretirement obligations 6,605 8,838
Deferred income taxes 14,792 17,550
Liability for uncertain tax positions 10,113 9,413
Other long-term liabilities 7,531 12,060
Total liabilities 155,104 175,555
Common stock:    
Capital in excess of par value 16,331 10,895
Retained earnings 336,778 294,270
Accumulated other comprehensive loss (8,176) (11,599)
Total stockholders’ equity 352,116 300,624
Total liabilities and equity 507,220 476,179
Class A Common Stock    
Common stock:    
Common stock 5,616 5,490
Class B Common Stock    
Common stock:    
Common stock $ 1,567 $ 1,568