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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 73,779us-gaap_NetIncomeLoss $ (20,104)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Unrealized gain on fair value of contingent consideration (6,527)us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized 0us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsRevenuesAndGainsRecognized
Unrealized gain on E.ON contingent obligation (353)cenx_UnrealizedGainLossOnEOnObligation (353)cenx_UnrealizedGainLossOnEOnObligation
Accrued and other plant curtailment costs — net 1,077cenx_PaymentsForCurtailment 1,092cenx_PaymentsForCurtailment
Lower of cost or market inventory adjustment 0us-gaap_InventoryWriteDown (1,107)us-gaap_InventoryWriteDown
Depreciation 18,131us-gaap_DepreciationDepletionAndAmortization 17,768us-gaap_DepreciationDepletionAndAmortization
Sebree power contract amortization 0cenx_AmortizationofAssumedPowerContract (5,534)cenx_AmortizationofAssumedPowerContract
Debt discount amortization 95us-gaap_AmortizationOfDebtDiscountPremium 88us-gaap_AmortizationOfDebtDiscountPremium
Pension and other postretirement benefits (984)us-gaap_PensionAndOtherPostretirementBenefitExpense 2,613us-gaap_PensionAndOtherPostretirementBenefitExpense
Deferred income taxes 8,851us-gaap_IncreaseDecreaseInDeferredIncomeTaxes 512us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Stock-based compensation 405us-gaap_ShareBasedCompensation 198us-gaap_ShareBasedCompensation
Equity in (earnings) losses of joint ventures, net of dividends (510)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 495us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Change in operating assets and liabilities:    
Accounts receivable — net 72,702us-gaap_IncreaseDecreaseInAccountsReceivable 10,566us-gaap_IncreaseDecreaseInAccountsReceivable
Due from affiliates (53,559)us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent (12,545)us-gaap_IncreaseDecreaseInDueFromRelatedPartiesCurrent
Inventories (14,335)us-gaap_IncreaseDecreaseInInventories (11,377)us-gaap_IncreaseDecreaseInInventories
Prepaid and other current assets 5,960us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (2,958)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable, trade (18,508)us-gaap_IncreaseDecreaseInAccountsPayableTrade (3,825)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Due to affiliates 27,773us-gaap_IncreaseDecreaseInDueToRelatedPartiesCurrent 20,798us-gaap_IncreaseDecreaseInDueToRelatedPartiesCurrent
Accrued and other current liabilities 2,874us-gaap_IncreaseDecreaseInAccruedLiabilities (6,620)us-gaap_IncreaseDecreaseInAccruedLiabilities
Other — net (604)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (448)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by (used in) operating activities 116,267us-gaap_NetCashProvidedByUsedInOperatingActivities (10,741)us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property, plant and equipment (10,960)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,700)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Nordural expansion — Helguvik (73)us-gaap_PaymentsToAcquireProjects (93)us-gaap_PaymentsToAcquireProjects
Purchase of carbon anode assets and improvements (1,594)cenx_PaymentsToAcquireCarbonAnodeAssets (5,724)cenx_PaymentsToAcquireCarbonAnodeAssets
Restricted and other cash deposits (21,012)us-gaap_IncreaseDecreaseInRestrictedCash 665us-gaap_IncreaseDecreaseInRestrictedCash
Net cash used in investing activities (33,639)us-gaap_NetCashProvidedByUsedInInvestingActivities (14,852)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings under revolving credit facilities 455us-gaap_ProceedsFromLinesOfCredit 18,870us-gaap_ProceedsFromLinesOfCredit
Repayments under revolving credit facilities (455)us-gaap_RepaymentsOfLinesOfCredit (24,870)us-gaap_RepaymentsOfLinesOfCredit
Repurchase of common stock (19,439)us-gaap_PaymentsForRepurchaseOfCommonStock 0us-gaap_PaymentsForRepurchaseOfCommonStock
Issuance of common stock 0us-gaap_ProceedsFromIssuanceOfCommonStock 3us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash used in financing activities (19,439)us-gaap_NetCashProvidedByUsedInFinancingActivities (5,997)us-gaap_NetCashProvidedByUsedInFinancingActivities
CHANGE IN CASH AND CASH EQUIVALENTS 63,189us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (31,590)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 163,242us-gaap_CashAndCashEquivalentsAtCarryingValue 84,088us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period $ 226,431us-gaap_CashAndCashEquivalentsAtCarryingValue $ 52,498us-gaap_CashAndCashEquivalentsAtCarryingValue