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No authoritative reference available. false 8 Other 4 us-gaap_OtherOperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0     false false false 2 false true false false 3475000 3475 false false false 3 false true false false 4622000 4622 false false false 4 false true false false 5507000 5507 false false false xbrli:monetaryItemType monetary The total amount of other operating income, not previously categorized, from items that are associated with the entity's normal revenue producing operation. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 true 16 Depletion, depreciation and amortization 4 us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortizationAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 17 Mine production 5 us-gaap_CostOfGoodsSoldDepreciationDepletionAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 16589000 16589 false false false 2 false true false false 17043000 17043 false false false 3 false true false false 35046000 35046 false false false 4 false true false false 34163000 34163 false false false xbrli:monetaryItemType monetary Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 true 20 Total costs of revenues 4 us-gaap_CostOfRevenue us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 110864000 110864 false false false 2 false true false false 82177000 82177 false false false 3 false true false false 222845000 222845 false false false 4 false true false false 171598000 171598 false false false xbrli:monetaryItemType monetary The aggregate cost of goods produced and sold and services rendered during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 true 21 Marketing 4 us-gaap_SellingAndMarketingExpense us-gaap true debit duration No definition available. false false false false false false false false false false false label false 1 false true false false 807000 807 false false false 2 false true false false 394000 394 false false false 3 false true false false 1275000 1275 false false false 4 false true false false 1235000 1235 false false false xbrli:monetaryItemType monetary The aggregate total amount of expenses directly related to the marketing or selling of products or services. 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No authoritative reference available. false 23 Loss on long-term investments 4 us-gaap_ImpairmentOfInvestments us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0     false false false 2 false false false false 0 0     false false false 3 false false false false 0 0     false false false 4 false true false false 119000 119 false false false xbrli:monetaryItemType monetary This element represents the amount by which the carrying amount exceeds the fair value of the investment. The amount is charged to income if the decline in fair value is deemed to be other than temporary. 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No authoritative reference available. true 26 Operating income (loss) 3 us-gaap_OperatingIncomeLoss us-gaap true credit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 15930000 15930 false false false 2 false true false false 5815000 5815 false false false 3 false true false false 30748000 30748 false false false 4 false true false false -4794000 -4794 false false false xbrli:monetaryItemType monetary The net result for the period of deducting operating expenses from operating revenues. No authoritative reference available. true 27 Other income (expense) 3 us-gaap_OtherNonoperatingIncomeExpenseAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 28 Other 4 us-gaap_OtherNonoperatingIncome us-gaap true credit duration No definition available. false false false false false false false false false false false false 1 false true false false 3000 3 false false false 2 false true false false 49000 49 false false false 3 false true false false 9000 9 false false false 4 false true false false 49000 49 false false false xbrli:monetaryItemType monetary The aggregate amount of other income amounts resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) profits on securities (net of losses), and (d) miscellaneous other income items. 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Includes deferred gains (losses) on qualifying hedges, unrealized holding gains (losses) on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 8 false 40 Basic earnings (loss) per share 4 us-gaap_EarningsPerShareBasicAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 41 Net income (loss) 5 us-gaap_EarningsPerShareBasic us-gaap true na duration No definition available. false false false false false false false false false false false terselabel true 1 true true false false 0.15 0.15 false false false 2 true true false false 0.05 0.05 false false false 3 true true false false 0.29 0.29 false false false 4 true true false false -0.07 -0.07 false false false us-types:perShareItemType decimal The amount of net income or loss for the period per each share of common stock outstanding during the reporting period. 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