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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ASSETS    
Cash and cash equivalents $ 94,329us-gaap_CashAndCashEquivalentsAtCarryingValue $ 106,933us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 18,961us-gaap_ShortTermInvestments 7,985us-gaap_ShortTermInvestments
Accounts receivable, less allowance for doubtful receivables of $5,481 and $3,932, respectively 11,133us-gaap_AccountsReceivableNetCurrent 12,556us-gaap_AccountsReceivableNetCurrent
Inventories 45,784us-gaap_InventoryNet 54,682us-gaap_InventoryNet
Prepaid assets 15,168us-gaap_PrepaidExpenseCurrent 17,281us-gaap_PrepaidExpenseCurrent
Other current assets 7,515us-gaap_OtherAssetsCurrent 6,483us-gaap_OtherAssetsCurrent
Disposal Group, Including Discontinued Operation, Assets, Current   34,208us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current assets 192,890us-gaap_AssetsCurrent 240,128us-gaap_AssetsCurrent
Property, plant and equipment, at cost:    
Land and buildings 85,788bth_LandAndBuildingsGross 89,575bth_LandAndBuildingsGross
Leasehold improvements 6,371us-gaap_LeaseholdImprovementsGross 6,460us-gaap_LeaseholdImprovementsGross
Machinery and equipment 76,147us-gaap_MachineryAndEquipmentGross 79,479us-gaap_MachineryAndEquipmentGross
Office furniture, data processing equipment and software 51,063us-gaap_PropertyPlantAndEquipmentOther 51,988us-gaap_PropertyPlantAndEquipmentOther
Construction in progress 1,184us-gaap_ConstructionInProgressGross 838us-gaap_ConstructionInProgressGross
Property, Plant and Equipment, Gross 220,553us-gaap_PropertyPlantAndEquipmentGross 228,340us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation 152,287us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 151,514us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, at cost: Less accumulated depreciation of $141,739 and $144,028, respectively 68,266us-gaap_PropertyPlantAndEquipmentNet 76,826us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Investments 7,951us-gaap_LongTermInvestments 1,070us-gaap_LongTermInvestments
Goodwill 2,298us-gaap_Goodwill 2,298us-gaap_Goodwill
Other intangible assets, net of accumulated amortization of $15,372 and $15,186, respectively 6,593us-gaap_IntangibleAssetsNetExcludingGoodwill 6,780us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 624us-gaap_DeferredTaxAssetsNetNoncurrent 4,369us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 8,731us-gaap_OtherAssetsNoncurrent 7,763us-gaap_OtherAssetsNoncurrent
Disposal Group, Including Discontinued Operation, Assets, Noncurrent   27,607us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
Total other assets 26,197us-gaap_AssetsNoncurrent 49,887us-gaap_AssetsNoncurrent
Total assets 287,353us-gaap_Assets 366,841us-gaap_Assets
LIABILITIES AND STOCKHOLDERS' EQUITY    
Current maturities of long-term debt 50,907us-gaap_LongTermDebtCurrent 952us-gaap_LongTermDebtCurrent
Accounts payable 23,358us-gaap_AccountsPayableCurrent 27,327us-gaap_AccountsPayableCurrent
Accrued expenses 41,327us-gaap_AccruedLiabilitiesCurrent 40,931us-gaap_AccruedLiabilitiesCurrent
Income taxes payable 1,193us-gaap_AccruedIncomeTaxesCurrent 669us-gaap_AccruedIncomeTaxesCurrent
Deferred Tax Liabilities, Net, Current 4,086us-gaap_DeferredTaxLiabilitiesCurrent 648us-gaap_DeferredTaxLiabilitiesCurrent
Other current liabilities 8,387us-gaap_OtherLiabilitiesCurrent 9,604us-gaap_OtherLiabilitiesCurrent
Disposal Group, Including Discontinued Operation, Liabilities, Current   23,966us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 129,258us-gaap_LiabilitiesCurrent 104,097us-gaap_LiabilitiesCurrent
Long-term debt, less current maturities 4,556us-gaap_LongTermDebtNoncurrent 55,326us-gaap_LongTermDebtNoncurrent
Deferred Tax Liabilities, Net, Noncurrent 7,309us-gaap_DeferredTaxLiabilitiesNoncurrent 0us-gaap_DeferredTaxLiabilitiesNoncurrent
Other liabilities 12,087us-gaap_OtherLiabilitiesNoncurrent 13,922us-gaap_OtherLiabilitiesNoncurrent
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent 0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent 147,468us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
Stockholders' equity:    
Common Stock, Value, Issued 533us-gaap_CommonStockValue 532us-gaap_CommonStockValue
Common stock - authorized 50,000,000 shares of $0.02 par value; issued 26,642,250 shares and 26,574,031 shares, respectively 169,897us-gaap_AdditionalPaidInCapitalCommonStock 168,732us-gaap_AdditionalPaidInCapitalCommonStock
Additional contributed capital 403,463us-gaap_RetainedEarningsAccumulatedDeficit 312,036us-gaap_RetainedEarningsAccumulatedDeficit
Retained earnings 11,849us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 16,362us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated other comprehensive income (452,171)us-gaap_TreasuryStockValue (452,040)us-gaap_TreasuryStockValue
Treasury stock, at cost, 10,572,020 shares and 10,557,342 shares, respectively 133,571us-gaap_StockholdersEquity 45,622us-gaap_StockholdersEquity
Total stockholders' equity 572us-gaap_MinorityInterest 406us-gaap_MinorityInterest
Noncontrolling interest 134,143us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 46,028us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total equity $ 287,353us-gaap_LiabilitiesAndStockholdersEquity $ 366,841us-gaap_LiabilitiesAndStockholdersEquity