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Discontinued Operations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Discontinued Operations [Abstract]      
Accrued expenses and other current liabilities $ 17us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities   $ 23us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities
Other long-term liabilities 1,976us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities   1,987us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities
Net sales and operating results classified as discontinued operations [Abstract]      
Net sales 0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue 142us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue  
Operating costs and expenses:      
Cost of sales 5us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold 110us-gaap_DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold  
Selling, general and administrative 33prmw_DisposalGroupIncludingDiscontinuedOperationSellingGeneralAndAdministrative 151prmw_DisposalGroupIncludingDiscontinuedOperationSellingGeneralAndAdministrative  
Total operating costs and expenses 38us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss 261us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss  
Loss from discontinued operations $ (38)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax $ (119)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax