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Business Acquisition - Restructuring (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Corpack headquarters and operating facility closing  
Restructuring Cost and Reserve [Line Items]  
Costs incurred $ 8,000,000
Employee Severance and Benefits  
Restructuring Cost and Reserve [Line Items]  
Remaining liability for costs incurred 0
Employee Severance and Benefits | Corpack headquarters and operating facility closing  
Restructuring Cost and Reserve [Line Items]  
Payments for restructuring $ (3,000,000)