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Summary of Significant Accounting Policies Long-Lived Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 16, 2018
Business Acquisition [Line Items]        
Asset Impairment Charges $ 0 $ 0 $ 0  
Horizon Plastics [Member]        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       $ 16,770,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment       $ 12,994,000