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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 $ 33,775us-gaap_CashAndCashEquivalentsAtCarryingValue $ 50,915us-gaap_CashAndCashEquivalentsAtCarryingValue
Trade receivables, net of allowance for doubtful accounts of $470 and $544, respectively 81,381us-gaap_AccountsReceivableNetCurrent 89,801us-gaap_AccountsReceivableNetCurrent
Inventories 35,144us-gaap_InventoryNet 16,864us-gaap_InventoryNet
Income taxes receivable 382us-gaap_IncomeTaxesReceivable 1,045us-gaap_IncomeTaxesReceivable
Deferred tax asset, net 2,320us-gaap_DeferredTaxAssetsNetCurrent 5,368us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 3,478us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,235us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 156,480us-gaap_AssetsCurrent 166,228us-gaap_AssetsCurrent
Property, plant and equipment:    
Equipment 62,231us-gaap_MachineryAndEquipmentGross 56,706us-gaap_MachineryAndEquipmentGross
Furniture and fixtures 617us-gaap_FurnitureAndFixturesGross 572us-gaap_FurnitureAndFixturesGross
Land, building and improvements 7,413us-gaap_BuildingsAndImprovementsGross 6,134us-gaap_BuildingsAndImprovementsGross
Total property, plant and equipment, at cost 70,261us-gaap_PropertyPlantAndEquipmentGross 63,412us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization 20,392us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 17,467us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, plant and equipment, net 49,869us-gaap_PropertyPlantAndEquipmentNet 45,945us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Goodwill 40,210us-gaap_Goodwill 30,226us-gaap_Goodwill
Restricted annuity contract 3,137powr_RestrictedAnnuityContract 3,137powr_RestrictedAnnuityContract
Intangible assets and capitalized software costs, net of accumulated amortization of $7,374 and $4,955, respectively 13,642us-gaap_IntangibleAssetsNetExcludingGoodwill 8,715us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 1,879us-gaap_OtherAssetsNoncurrent 1,240us-gaap_OtherAssetsNoncurrent
Total other assets 58,868us-gaap_OtherAssets 43,318us-gaap_OtherAssets
Total Assets 265,217us-gaap_Assets 255,491us-gaap_Assets
Current liabilities:    
Accounts payable 39,699us-gaap_AccountsPayableCurrent 24,299us-gaap_AccountsPayableCurrent
Accrued and other liabilities 41,113us-gaap_AccruedLiabilitiesCurrent 31,195us-gaap_AccruedLiabilitiesCurrent
Accrued restructuring liabilities 114us-gaap_RestructuringReserveCurrent 965us-gaap_RestructuringReserveCurrent
Current portion of long-term debt 3,731us-gaap_SecuredDebtCurrent 3,731us-gaap_SecuredDebtCurrent
Current portion of capital lease obligation 986us-gaap_CapitalLeaseObligationsCurrent 935us-gaap_CapitalLeaseObligationsCurrent
Total current liabilities 85,643us-gaap_LiabilitiesCurrent 61,125us-gaap_LiabilitiesCurrent
Long-term liabilities:    
Revolving line of credit      
Long-term debt, net of current portion 17,832us-gaap_SecuredLongTermDebt 21,563us-gaap_SecuredLongTermDebt
Capital lease obligation, net of current portion   986us-gaap_CapitalLeaseObligationsNoncurrent
Deferred tax liability, net 1,460us-gaap_DeferredTaxLiabilitiesNoncurrent 8,865us-gaap_DeferredTaxLiabilitiesNoncurrent
Other long-term liabilities 3,913us-gaap_OtherLiabilitiesNoncurrent 3,365us-gaap_OtherLiabilitiesNoncurrent
Total long-term liabilities 23,205us-gaap_LiabilitiesNoncurrent 34,779us-gaap_LiabilitiesNoncurrent
Commitments and contingencies (Notes 10 and 12)      
Stockholders' Equity:    
Preferred stock      
Common stock, $.01 par value; 50,000,000 shares authorized; 22,369,487 and 21,945,720 shares issued and outstanding, respectively 224us-gaap_CommonStockValue 219us-gaap_CommonStockValue
Additional paid-in-capital 161,163us-gaap_AdditionalPaidInCapital 157,401us-gaap_AdditionalPaidInCapital
Retained earnings (deficit) (4,941)us-gaap_RetainedEarningsAccumulatedDeficit 2,051us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (loss) (77)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (84)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 156,369us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 159,587us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Stockholders' Equity 265,217us-gaap_LiabilitiesAndStockholdersEquity 255,491us-gaap_LiabilitiesAndStockholdersEquity
Series C Preferred Stock [Member]    
Stockholders' Equity:    
Preferred stock