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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 |  |

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