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Critical Accounting Policies and Estimates (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
ReportingUnits
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Unusual or Infrequent Item, or Both [Line Items]          
Repayments of Lines of Credit     $ 59,356,000 $ 148,679,000  
Income tax receivable $ 2,657,000   2,657,000   $ 652,000
Accounts Receivable, Allowance for Credit Loss 130,000   130,000   50,000
Accounts Receivable, Allowance for Credit Loss, Chargebacks 105,000   105,000   476,000
Inventory Valuation Reserves 726,000   726,000   898,000
Contract with Customer, Asset, Not Past Due 343,000   343,000   888,000
Contract with Customer, Liability, Revenue Recognized 5,710,000        
Deferred Income Tax Assets, Net 2,026,000   2,026,000    
Deferred Income Tax Liabilities, Net 517,000   517,000    
Asset Impairment Charges $ 0 $ 0      
Number of Reporting Units | ReportingUnits 2        
Impairment $ 0 4,100,000 0 4,100,000  
Self Insurance Reserve 807,000   807,000   1,203,000
Postemployment Benefits Liability 9,207,000   9,207,000   $ 9,160,000
Government Grant $ 25,000 $ 1,416,000      
Contract-Based Intangible Assets [Member]          
Unusual or Infrequent Item, or Both [Line Items]          
Impairment of Intangible Assets, Finite-lived     $ 0    
Horizon Plastics reporting unit [Member]          
Unusual or Infrequent Item, or Both [Line Items]          
Impairment       $ 4,100,000  
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount   19.00%   19.00%