Acquisitions - Other Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired					$ 67,090	$ 0
Net sales	$ 236,830		$ 223,780		697,490	$ 665,790
Non-cash purchase accounting related expenses					1,200
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					$ 300