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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and cash equivalents $ 91,395us-gaap_CashAndCashEquivalentsAtCarryingValue $ 102,434us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 71,848us-gaap_AccountsReceivableNetCurrent 72,957us-gaap_AccountsReceivableNetCurrent
Inventories, net 76,422us-gaap_InventoryNet 75,334us-gaap_InventoryNet
Other receivables 4,535us-gaap_OtherReceivablesNetCurrent 10,616us-gaap_OtherReceivablesNetCurrent
Prepaid expenses 10,311us-gaap_PrepaidExpenseCurrent 7,560us-gaap_PrepaidExpenseCurrent
Current deferred income tax assets 43us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 237us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 7,224us-gaap_OtherAssetsCurrent 6,898us-gaap_OtherAssetsCurrent
Total current assets 261,778us-gaap_AssetsCurrent 276,036us-gaap_AssetsCurrent
Property, plant and equipment, net 216,486us-gaap_PropertyPlantAndEquipmentNet 223,766us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 2,422us-gaap_IntangibleAssetsNetIncludingGoodwill 2,451us-gaap_IntangibleAssetsNetIncludingGoodwill
Long-term prepaid expenses 9,951us-gaap_PrepaidExpenseNoncurrent 10,916us-gaap_PrepaidExpenseNoncurrent
Deferred income tax assets 281us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 415us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other non-current assets 14,548us-gaap_OtherAssetsNoncurrent 14,147us-gaap_OtherAssetsNoncurrent
Total assets 505,466us-gaap_Assets 527,731us-gaap_Assets
Current liabilities    
Accounts payable 73,812us-gaap_AccountsPayableCurrent 70,767us-gaap_AccountsPayableCurrent
Other accounts payable 8,195us-gaap_AccountsPayableOtherCurrent 10,986us-gaap_AccountsPayableOtherCurrent
Accrued expenses 74,573us-gaap_AccruedLiabilitiesCurrent 81,060us-gaap_AccruedLiabilitiesCurrent
Other current liabilities 4,616us-gaap_OtherLiabilitiesCurrent 6,460us-gaap_OtherLiabilitiesCurrent
Total current liabilities 161,196us-gaap_LiabilitiesCurrent 169,273us-gaap_LiabilitiesCurrent
Long-term borrowings, net 224,065us-gaap_LongTermDebtNoncurrent 224,035us-gaap_LongTermDebtNoncurrent
Accrued severance benefits, net 144,491us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits 139,289us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Other non-current liabilities 11,489us-gaap_OtherLiabilitiesNoncurrent 13,636us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 541,241us-gaap_Liabilities 546,233us-gaap_Liabilities
Commitments and Contingencies (Note 16)      
Stockholders' equity    
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,635,233 shares issued and 34,056,468 outstanding at March 31, 2015 and December 31, 2014 406us-gaap_CommonStockValue 406us-gaap_CommonStockValue
Additional paid-in capital 118,604us-gaap_AdditionalPaidInCapitalCommonStock 118,419us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated deficit (31,372)us-gaap_RetainedEarningsAccumulatedDeficit (11,343)us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, 6,578,765 shares at March 31, 2015 and December 31, 2014 (90,918)us-gaap_TreasuryStockValue (90,918)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (32,495)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (35,066)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity (deficit) (35,775)us-gaap_StockholdersEquity (18,502)us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 505,466us-gaap_LiabilitiesAndStockholdersEquity $ 527,731us-gaap_LiabilitiesAndStockholdersEquity