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Consolidated Statements of Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Consolidated Statements of Comprehensive Loss [Abstract]      
Net loss $ (11,265)us-gaap_NetIncomeLoss $ (10,776)us-gaap_NetIncomeLoss $ (7,321)us-gaap_NetIncomeLoss
Change in employees plan assets and benefit obligations , net of taxes $1,774, $1,268 and $1,591 for the years ended December 31, 2014, 2013 and 2012, respectively (3,860)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 2,350us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 2,440us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Comprehensive loss $ (15,125)us-gaap_ComprehensiveIncomeNetOfTax $ (8,426)us-gaap_ComprehensiveIncomeNetOfTax $ (4,881)us-gaap_ComprehensiveIncomeNetOfTax