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Revenue from Contracts with Customers Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 198,632 | $ 213,897 | $ 221,666 | $ 213,256 | $ 199,477 | $ 205,683 | $ 197,010 | $ 168,487 |  |  |
Income (loss) from operations |  |  |  |  |  |  |  |  | $ 9,889 | $ (179,864) | $ 31,780
Inventories | $ 118,722 |  |  |  | $ 120,925 |  |  |  | $ 118,722 | $ 120,925 |

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