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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 $ 21,286us-gaap_ProfitLoss $ 13,008us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 16,127us-gaap_DepreciationDepletionAndAmortization 16,098us-gaap_DepreciationDepletionAndAmortization
Deferred compensation 1,577scl_DeferredCompensationExpenseBenefit (248)scl_DeferredCompensationExpenseBenefit
Realized and unrealized gain on long-term investments (531)us-gaap_GainLossOnInvestments (23)us-gaap_GainLossOnInvestments
Stock-based compensation 798us-gaap_ShareBasedCompensation 226us-gaap_ShareBasedCompensation
Deferred income taxes (1,261)us-gaap_DeferredIncomeTaxExpenseBenefit (1,851)us-gaap_DeferredIncomeTaxExpenseBenefit
Other non-cash items (2,403)us-gaap_OtherNoncashIncomeExpense 1,573us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:    
Receivables, net (11,546)us-gaap_IncreaseDecreaseInReceivables (30,013)us-gaap_IncreaseDecreaseInReceivables
Inventories 4,969us-gaap_IncreaseDecreaseInInventories (13,245)us-gaap_IncreaseDecreaseInInventories
Other current assets (1,703)us-gaap_IncreaseDecreaseInOtherOperatingAssets 646us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued liabilities 6,653us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 6,291us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Pension liabilities 111us-gaap_IncreaseDecreaseInPensionPlanObligations (466)us-gaap_IncreaseDecreaseInPensionPlanObligations
Environmental and legal liabilities 90scl_EnvironmentalAndLegalLiabilitiesIncreaseDecrease (357)scl_EnvironmentalAndLegalLiabilitiesIncreaseDecrease
Deferred revenues (195)us-gaap_DeferredRevenuePeriodIncreaseDecrease (183)us-gaap_DeferredRevenuePeriodIncreaseDecrease
Excess tax benefit from stock options and awards (120)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (414)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Net Cash Provided By (Used) In Operating Activities 33,852us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (8,958)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows From Investing Activities    
Expenditures for property, plant and equipment (28,295)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (20,503)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of product line (Note 14) 3,262scl_ProceedsFromSaleOfProductLine  
Sale of mutual funds 782us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity 738us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesEquity
Other, net (855)us-gaap_PaymentsForProceedsFromOtherInvestingActivities (3,362)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net Cash Used In Investing Activities (25,106)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (23,127)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows From Financing Activities    
Revolving debt and bank overdrafts, net 14,241us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess (311)us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
Other debt repayments (2,063)us-gaap_RepaymentsOfLongTermDebt (688)us-gaap_RepaymentsOfLongTermDebt
Dividends paid (4,047)us-gaap_PaymentsOfDividends (3,800)us-gaap_PaymentsOfDividends
Company stock repurchased   (430)us-gaap_PaymentsForRepurchaseOfCommonStock
Stock option exercises 167us-gaap_ProceedsFromStockOptionsExercised 904us-gaap_ProceedsFromStockOptionsExercised
Excess tax benefit from stock options and awards 120us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 414us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Other, net (275)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (100)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net Cash Provided By (Used In) Financing Activities 8,143us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (4,011)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of Exchange Rate Changes on Cash (4,796)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (531)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net Increase (Decrease) in Cash and Cash Equivalents 12,093us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (36,627)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents at Beginning of Period 85,215us-gaap_CashAndCashEquivalentsAtCarryingValue 133,347us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents at End of Period 97,308us-gaap_CashAndCashEquivalentsAtCarryingValue 96,720us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Cash Flow Information    
Cash (refunds) payments of income taxes, net (2,920)us-gaap_IncomeTaxesPaidNet 2,790us-gaap_IncomeTaxesPaidNet
Cash payments of interest $ 435us-gaap_InterestPaid $ 463us-gaap_InterestPaid