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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 102,434us-gaap_CashAndCashEquivalentsAtCarryingValue $ 153,606us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash   4us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 72,957us-gaap_AccountsReceivableNetCurrent 78,898us-gaap_AccountsReceivableNetCurrent
Inventories, net 75,334us-gaap_InventoryNet 74,698us-gaap_InventoryNet
Other receivables 10,616us-gaap_OtherReceivablesNetCurrent 6,011us-gaap_OtherReceivablesNetCurrent
Prepaid expenses 7,560us-gaap_PrepaidExpenseCurrent 9,194us-gaap_PrepaidExpenseCurrent
Current deferred income tax assets 237us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,348us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 6,898us-gaap_OtherAssetsCurrent 10,403us-gaap_OtherAssetsCurrent
Total current assets 276,036us-gaap_AssetsCurrent 334,162us-gaap_AssetsCurrent
Property, plant and equipment, net 223,766us-gaap_PropertyPlantAndEquipmentNet 254,297us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 2,451us-gaap_IntangibleAssetsNetIncludingGoodwill 3,111us-gaap_IntangibleAssetsNetIncludingGoodwill
Long-term prepaid expenses 10,916us-gaap_PrepaidExpenseNoncurrent 16,405us-gaap_PrepaidExpenseNoncurrent
Deferred income tax assets 415us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 896us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other non-current assets 14,147us-gaap_OtherAssetsNoncurrent 16,319us-gaap_OtherAssetsNoncurrent
Total assets 527,731us-gaap_Assets 625,190us-gaap_Assets
Current liabilities    
Accounts payable 70,767us-gaap_AccountsPayableCurrent 75,059us-gaap_AccountsPayableCurrent
Other accounts payable 10,986us-gaap_AccountsPayableOtherCurrent 15,670us-gaap_AccountsPayableOtherCurrent
Accrued expenses 81,060us-gaap_AccruedLiabilitiesCurrent 65,494us-gaap_AccruedLiabilitiesCurrent
Other current liabilities 6,460us-gaap_OtherLiabilitiesCurrent 5,872us-gaap_OtherLiabilitiesCurrent
Total current liabilities 169,273us-gaap_LiabilitiesCurrent 162,095us-gaap_LiabilitiesCurrent
Long-term borrowings, net 224,035us-gaap_LongTermDebtNoncurrent 223,923us-gaap_LongTermDebtNoncurrent
Accrued severance benefits, net 139,289us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits 134,172us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Other non-current liabilities 13,636us-gaap_OtherLiabilitiesNoncurrent 23,459us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 546,233us-gaap_Liabilities 543,649us-gaap_Liabilities
Commitments and contingencies (Note 18)      
Stockholders' equity    
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,635,233 shares issued and 34,056,468 outstanding at December 31, 2014 and 40,627,131 shares issued and 34,048,366 outstanding at December 31, 2013 406us-gaap_CommonStockValue 406us-gaap_CommonStockValue
Additional paid-in capital 118,419us-gaap_AdditionalPaidInCapitalCommonStock 116,222us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings (deficit) (11,343)us-gaap_RetainedEarningsAccumulatedDeficit 105,889us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, 6,578,765 shares at December 31, 2014 and 2013, respectively (90,918)us-gaap_TreasuryStockValue (90,918)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (35,066)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (50,058)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity (deficit) (18,502)us-gaap_StockholdersEquity 81,541us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 527,731us-gaap_LiabilitiesAndStockholdersEquity $ 625,190us-gaap_LiabilitiesAndStockholdersEquity