Acquisitions - Other Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Feb. 27, 2020
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired							$ 95,160	$ 67,090
Net sales	$ 199,460			$ 188,410			581,800	552,610
Non-cash purchase accounting related expenses								1,200
Rapak [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 11,400
Net sales									$ 30,000
RSA Engineered Products [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 83,700
Business Combinations, Assets Acquired and Liabilities Assumed, Goodwill and Intangible Assets											$ 80,200
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Net Working Capital											10,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment											2,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities											$ 8,700
Net sales									$ 30,000
Taplast S.p.A. [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired					$ 44,700
Net sales										$ 32,000
Plastic Srl [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired						$ 22,400
Net sales										$ 12,000
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Non-cash purchase accounting related expenses								900
Cost of Sales [Member]
Business Acquisition [Line Items]
Non-cash purchase accounting related expenses							$ 2,800	$ 300