| Sales of products | 171.3M |
| Cost of sales and other direct production costs | 82.95M |
| Depreciation, depletion and amortization | 29.9M |
| [CostOfRevenue] | |
| Gross profit | |
| General and administrative | 10.36M |
| Exploration | |
| Other operating expense | |
| Provision for closed operations and environmental matters | |
| [DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax] | |
| Income from operations | |
| Gain (loss) on sale or impairment of investments | |
| Gain (loss) on derivative contracts | |
| Interest and other income | |
| Interest expense | |
| [NonoperatingIncomeExpense] | |
| Income before income taxes | 35.61M |
| Income tax provision | 11.5M |
| Net income | |
| Reclassification of net (gain) loss on sale or impairment of marketable securities included in net income | |
| Unrealized holding losses on investments | |
| Comprehensive income | |
| Basic income per common share after preferred dividends (in Dollars per share) | |
| Diluted income per common share after preferred dividends (in Dollars per share) | |
| Weighted average number of common shares outstanding - basic (in Shares) | |
| Weighted average number of common shares outstanding - diluted (in Shares) | |
| Preferred stock dividends | 138K |
| Income applicable to common shareholders | 23.98M |