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INTEREST AND OTHER EXPENSE, NET (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
INTEREST AND OTHER EXPENSE, NET    
Interest expense $ (565)us-gaap_InterestExpense $ (661)us-gaap_InterestExpense
Interest and dividend income 41us-gaap_InvestmentIncomeInterestAndDividend 53us-gaap_InvestmentIncomeInterestAndDividend
Derivative loss (124)us-gaap_DerivativeGainLossOnDerivativeNet (12)us-gaap_DerivativeGainLossOnDerivativeNet
Bank and portfolio asset management fees (354)newp_BankAndPortfolioAssetManagementFees (260)newp_BankAndPortfolioAssetManagementFees
Other income (expense), net 99newp_OtherIncomeExpenseNet (96)newp_OtherIncomeExpenseNet
Total $ (903)us-gaap_OtherNonoperatingIncomeExpense $ (976)us-gaap_OtherNonoperatingIncomeExpense