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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets    
Cash and cash equivalents $ 140,997us-gaap_CashAndCashEquivalentsAtCarryingValue $ 153,606us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash   4us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 72,108us-gaap_AccountsReceivableNetCurrent 78,898us-gaap_AccountsReceivableNetCurrent
Inventories, net 89,976us-gaap_InventoryNet 74,698us-gaap_InventoryNet
Other receivables 5,513us-gaap_OtherReceivablesNetCurrent 6,011us-gaap_OtherReceivablesNetCurrent
Prepaid expenses 11,261us-gaap_PrepaidExpenseCurrent 9,194us-gaap_PrepaidExpenseCurrent
Current deferred income tax assets 1,028us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 1,348us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 13,455us-gaap_OtherAssetsCurrent 10,403us-gaap_OtherAssetsCurrent
Total current assets 334,338us-gaap_AssetsCurrent 334,162us-gaap_AssetsCurrent
Property, plant and equipment, net 263,700us-gaap_PropertyPlantAndEquipmentNet 254,297us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 2,849us-gaap_IntangibleAssetsNetIncludingGoodwill 3,111us-gaap_IntangibleAssetsNetIncludingGoodwill
Long-term prepaid expenses 13,683us-gaap_PrepaidExpenseNoncurrent 16,405us-gaap_PrepaidExpenseNoncurrent
Deferred income tax assets 619us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 896us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Other non-current assets 15,165us-gaap_OtherAssetsNoncurrent 16,319us-gaap_OtherAssetsNoncurrent
Total assets 630,354us-gaap_Assets 625,190us-gaap_Assets
Current liabilities    
Accounts payable 81,525us-gaap_AccountsPayableCurrent 75,059us-gaap_AccountsPayableCurrent
Other accounts payable 15,259us-gaap_AccountsPayableOtherCurrent 15,670us-gaap_AccountsPayableOtherCurrent
Accrued expenses 77,864us-gaap_AccruedLiabilitiesCurrent 65,494us-gaap_AccruedLiabilitiesCurrent
Other current liabilities 6,853us-gaap_OtherLiabilitiesCurrent 5,872us-gaap_OtherLiabilitiesCurrent
Total current liabilities 181,501us-gaap_LiabilitiesCurrent 162,095us-gaap_LiabilitiesCurrent
Long-term borrowings, net 223,978us-gaap_LongTermDebtNoncurrent 223,923us-gaap_LongTermDebtNoncurrent
Accrued severance benefits, net 145,711us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits 134,172us-gaap_SupplementalUnemploymentBenefitsSeveranceBenefits
Other non-current liabilities 19,539us-gaap_OtherLiabilitiesNoncurrent 23,459us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 570,729us-gaap_Liabilities 543,649us-gaap_Liabilities
Commitments and Contingencies (Note 17)      
Stockholders' equity    
Common stock, $0.01 par value, 150,000,000 shares authorized, 40,635,128 shares issued and 34,056,363 outstanding at June 30, 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 117,361us-gaap_AdditionalPaidInCapitalCommonStock 116,222us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 99,294us-gaap_RetainedEarningsAccumulatedDeficit 105,889us-gaap_RetainedEarningsAccumulatedDeficit
Treasury stock, 6,578,765 shares at June 30, 2014 and December 31, 2013 (90,918)us-gaap_TreasuryStockValue (90,918)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss (66,518)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (50,058)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 59,625us-gaap_StockholdersEquity 81,541us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 630,354us-gaap_LiabilitiesAndStockholdersEquity $ 625,190us-gaap_LiabilitiesAndStockholdersEquity