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Condensed Consolidated Balance Sheets (Current Period Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 196,231us-gaap_CashAndCashEquivalentsAtCarryingValue $ 209,665us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable:    
Trade 27,280us-gaap_AccountsReceivableNetCurrent 17,696us-gaap_AccountsReceivableNetCurrent
Taxes 10,303us-gaap_IncomeTaxReceivable 10,392us-gaap_IncomeTaxReceivable
Other, net 5,215us-gaap_OtherReceivables 6,792us-gaap_OtherReceivables
Inventories:    
Concentrates, doré, and stockpiled ore 22,921us-gaap_InventoryFinishedGoods 25,999us-gaap_InventoryFinishedGoods
Materials and supplies 20,974us-gaap_OtherInventorySupplies 21,474us-gaap_OtherInventorySupplies
Current deferred income taxes 10,064us-gaap_DeferredTaxAssetsNetCurrent 12,029us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 15,337us-gaap_OtherAssetsCurrent 12,312us-gaap_OtherAssetsCurrent
Total current assets 308,325us-gaap_AssetsCurrent 316,359us-gaap_AssetsCurrent
Non-current investments 4,334us-gaap_LongTermInvestments 4,920us-gaap_LongTermInvestments
Non-current restricted cash and investments 883us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 883us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Properties, plant, equipment and mineral interests, net 1,837,173us-gaap_PropertyPlantAndEquipmentNet 1,831,564us-gaap_PropertyPlantAndEquipmentNet
Non-current deferred income taxes 98,544us-gaap_DeferredTaxAssetsNetNoncurrent 98,923us-gaap_DeferredTaxAssetsNetNoncurrent
Other non-current assets and deferred charges 10,692us-gaap_OtherAssetsNoncurrent 9,415us-gaap_OtherAssetsNoncurrent
Total assets 2,259,951us-gaap_Assets 2,262,064us-gaap_Assets
Current liabilities:    
Accounts payable and accrued liabilities 39,712us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 41,869us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Accrued payroll and related benefits 18,320us-gaap_EmployeeRelatedLiabilitiesCurrent 27,956us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued taxes 3,891us-gaap_TaxesPayableCurrent 4,241us-gaap_TaxesPayableCurrent
Current portion of capital leases 10,289us-gaap_CapitalLeaseObligationsCurrent 9,491us-gaap_CapitalLeaseObligationsCurrent
Current portion of accrued reclamation and closure costs 1,631us-gaap_AccruedReclamationCostsCurrent 1,631us-gaap_AccruedReclamationCostsCurrent
Other current liabilities 14,695us-gaap_OtherLiabilitiesCurrent 5,797us-gaap_OtherLiabilitiesCurrent
Total current liabilities 88,538us-gaap_LiabilitiesCurrent 90,985us-gaap_LiabilitiesCurrent
Capital leases 11,590us-gaap_CapitalLeaseObligationsNoncurrent 13,650us-gaap_CapitalLeaseObligationsNoncurrent
Accrued reclamation and closure costs 55,781us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent 55,619us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Long-term Debt 498,791us-gaap_LongTermDebtNoncurrent 498,479us-gaap_LongTermDebtNoncurrent
Non-current deferred tax liability 138,422us-gaap_DeferredTaxLiabilitiesNoncurrent 153,300us-gaap_DeferredTaxLiabilitiesNoncurrent
Other non-current liabilities 47,504us-gaap_OtherLiabilitiesNoncurrent 53,057us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 840,626us-gaap_Liabilities 865,090us-gaap_Liabilities
Commitments and contingencies (Notes 2, 4, 7, 9, and 11)      
Preferred stock, 5,000,000 shares authorized:    
Series B preferred stock, $0.25 par value, 157,816 shares issued and outstanding, liquidation preference — $7,891 39us-gaap_PreferredStockValue 39us-gaap_PreferredStockValue
Common stock, $0.25 par value, 500,000,000 shares authorized; issued and outstanding 2015 — 369,992,839 shares and 2014 — 367,376,863 shares 93,106us-gaap_CommonStockValue 92,382us-gaap_CommonStockValue
Capital surplus 1,495,893us-gaap_AdditionalPaidInCapital 1,486,750us-gaap_AdditionalPaidInCapital
Accumulated deficit (129,817)us-gaap_RetainedEarningsAccumulatedDeficit (141,306)us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (30,095)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (32,031)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Less treasury stock, at cost; 2015 - 2,433,518 and 2014 - 2,151,482 (9,801)us-gaap_TreasuryStockValue (8,860)us-gaap_TreasuryStockValue
Total stockholders’ equity 1,419,325us-gaap_StockholdersEquity 1,396,974us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 2,259,951us-gaap_LiabilitiesAndStockholdersEquity $ 2,262,064us-gaap_LiabilitiesAndStockholdersEquity