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Post Retirement Benefits - Post Retirement Benefits Expense (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Pension, health and life insurance expense:      
Multi-employer plan contributions $ 719,000us-gaap_MultiemployerPlanPeriodContributions [1] $ 464,000us-gaap_MultiemployerPlanPeriodContributions [1] $ 443,000us-gaap_MultiemployerPlanPeriodContributions [1]
Defined contribution plan contributions 701,000us-gaap_DefinedBenefitPlanContributionsByEmployer 571,000us-gaap_DefinedBenefitPlanContributionsByEmployer 527,000us-gaap_DefinedBenefitPlanContributionsByEmployer
Total pension expense 1,420,000us-gaap_PensionExpense 1,035,000us-gaap_PensionExpense 970,000us-gaap_PensionExpense
Interest cost 277,000us-gaap_DefinedBenefitPlanInterestCost 332,000us-gaap_DefinedBenefitPlanInterestCost 364,000us-gaap_DefinedBenefitPlanInterestCost
Amortization of prior service costs (496,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit (496,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit (496,000)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
Amortization of net loss 47,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax 201,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax 159,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax
Net periodic benefit cost (172,000)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 37,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 27,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Total post retirement benefits expense 1,248,000us-gaap_PostemploymentBenefitsPeriodExpense 1,072,000us-gaap_PostemploymentBenefitsPeriodExpense 997,000us-gaap_PostemploymentBenefitsPeriodExpense
Postretirement benefits      
Pension, health and life insurance expense:      
Interest cost $ 277,000us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 $ 332,000us-gaap_DefinedBenefitPlanInterestCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		  
[1] The National Pension Plan utilized a five year amortization extension in accordance with § 431(d) of the Internal Revenue Code of 1986 ("the Code") to amortize its losses from 2008. The plan re-certified its zone status after using the amortization provisions of the Code. The Company's contributions to the plan did not represent more than 5% of total contributions to the plan as indicated in the plan's most recently available annual report for the plan year ended December 31, 2013. Under the terms of the collective-bargaining agreement, the Company is required to make contributions to the plan for each hour worked up to a maximum of 40 hours per person, per week, at the following rates: $1.20 per hour from August 8, 2011 through August 12, 2012; $1.25 per hour from August 13, 2012 through August 10, 2013